diff --git a/build/application.linux-arm64/data/save.csv b/build/application.linux-arm64/data/save.csv
index 4ed18e7..139597f 100644
--- a/build/application.linux-arm64/data/save.csv
+++ b/build/application.linux-arm64/data/save.csv
@@ -1,43 +1,2 @@
 
 
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-Biological Process,395,537,32,33
-Physiological Process,292,455,34
-Cellular Process,483,455,34
-Cellular Physiological Process,391,375,36,35
-Cell Cycle,305,296,40,41
-Cell Division,544,265,37
-Cytokinesis,543,165,38
-Cytokinesis after Meiosis,399,54
-M Phase of Meiotic Cell Cycle,310,144,38
-M Phase,239,225,39
-Meiotic Cell Cycle,392,225,39
-
diff --git a/build/application.linux-arm64/lib/ontology.jar b/build/application.linux-arm64/lib/ontology.jar
index 8379e9f..f218851 100644
Binary files a/build/application.linux-arm64/lib/ontology.jar and b/build/application.linux-arm64/lib/ontology.jar differ
diff --git a/build/application.linux-arm64/source/buttons.pde b/build/application.linux-arm64/source/gui.pde
similarity index 63%
rename from build/application.linux-arm64/source/buttons.pde
rename to build/application.linux-arm64/source/gui.pde
index 525ddb1..4b9de3a 100644
--- a/build/application.linux-arm64/source/buttons.pde
+++ b/build/application.linux-arm64/source/gui.pde
@@ -1,19 +1,26 @@
-int buttonCount = 6;
+int buttonCount = 8;
 int i_buttonId;
 
+
+
+
 void initButtons() {
-  buttons[0] = new Button(10, 10, "Add Node");
-  buttons[1] = new Button(104, 10, "Delete Node");
+  buttons[0] = new Button(72, 10, "Add Node");
+  buttons[1] = new Button(164, 10, "Delete Node");
   buttons[2] = new Button(10, 50, "Dark/Bright Mode");
   buttons[3] = new Button(10, 90, "Save");
   buttons[4] = new Button(10, 130, "Open");
   buttons[5] = new Button(10, 170, "Export Image");
-/*  buttons[0] = new Button(10, 10, "Node Hinzufügen");
-  buttons[1] = new Button(155, 10, "Löschen");
-  buttons[2] = new Button(10, 50, "Farben umkehren");
-  buttons[3] = new Button(10, 90, "Speichern");
-  buttons[4] = new Button(10, 130, "Öffnen");
-  buttons[5] = new Button(10, 170, "Bild Exportieren");*/
+  buttons[6] = new Button(10, 210, "Empty Workspace");
+  buttons[7] = new Button(10, 10, "Menu");
+  /*  buttons[0] = new Button(10, 10, "Node Hinzufügen");
+   buttons[1] = new Button(155, 10, "Löschen");
+   buttons[2] = new Button(10, 50, "Farben umkehren");
+   buttons[3] = new Button(10, 90, "Speichern");
+   buttons[4] = new Button(10, 130, "Öffnen");
+   buttons[5] = new Button(10, 170, "Bild Exportieren");
+   buttons[6] = new Button(10, 210, "Arbeitsfläche leeren");
+   buttons[7] = new Button(10, 210, "Menü");*/
 }
 
 void buttonFunctions(int functionID) {
@@ -38,6 +45,12 @@ void buttonFunctions(int functionID) {
     case(5):
     selectOutput("Where to export .png image file to?", "savePNGFile");
     break;
+    case(6):
+    deleteAll();
+    break;
+    case(7):
+    menu();
+    break;
   default:
     break;
   }
@@ -76,3 +89,12 @@ class Button {
     text(label, x+9, y+h/2+5);
   }
 }
+
+boolean menuOpen;
+
+void menu() {
+  if (menuOpen) {
+  } else {
+  }
+  menuOpen = !menuOpen;
+}
diff --git a/build/application.linux-arm64/source/ontology.java b/build/application.linux-arm64/source/ontology.java
index f7bfd3a..cf773f7 100644
--- a/build/application.linux-arm64/source/ontology.java
+++ b/build/application.linux-arm64/source/ontology.java
@@ -23,11 +23,12 @@ boolean darkMode = true;
 public void setup() {
   
   surface.setResizable(true);
+  //frame.setResizable(true);
 
   textSize(textSize);
 
   initButtons();
-  
+
   /**
    * When saving, a copy of the save-file is stored locally which is opened when starting the program
    */
@@ -72,10 +73,14 @@ public void draw() {
     textAlign(CORNER);
     buttons[0].display();
     if (i_selectedNode != -1) buttons[1].display();
-    buttons[2].display();
-    buttons[3].display();
-    buttons[4].display();
-    buttons[5].display();
+    if (menuOpen) {
+      buttons[2].display();
+      buttons[3].display();
+      buttons[4].display();
+      buttons[5].display();
+      buttons[6].display();
+    }
+    buttons[7].display();
     rectMode(CENTER);
     textAlign(CENTER);
     textSize(textSize);
@@ -97,22 +102,42 @@ public void draw() {
     }
   }
 }
-int buttonCount = 6;
+
+public void deleteAll() {
+  for (int i = 0; i < nodeCount; i++) {
+    //nodes[i].deleted = true;
+    i_selectedNode = i;
+    deleteSelectedNode();
+  }
+  nodeCount = 0;
+  for (int i = 0; i < linkCount; i++) {
+    links[i].active = false;
+  }
+  linkCount = 0;
+}
+int buttonCount = 8;
 int i_buttonId;
 
+
+
+
 public void initButtons() {
-  buttons[0] = new Button(10, 10, "Add Node");
-  buttons[1] = new Button(104, 10, "Delete Node");
+  buttons[0] = new Button(72, 10, "Add Node");
+  buttons[1] = new Button(164, 10, "Delete Node");
   buttons[2] = new Button(10, 50, "Dark/Bright Mode");
   buttons[3] = new Button(10, 90, "Save");
   buttons[4] = new Button(10, 130, "Open");
   buttons[5] = new Button(10, 170, "Export Image");
-/*  buttons[0] = new Button(10, 10, "Node Hinzufügen");
-  buttons[1] = new Button(155, 10, "Löschen");
-  buttons[2] = new Button(10, 50, "Farben umkehren");
-  buttons[3] = new Button(10, 90, "Speichern");
-  buttons[4] = new Button(10, 130, "Öffnen");
-  buttons[5] = new Button(10, 170, "Bild Exportieren");*/
+  buttons[6] = new Button(10, 210, "Empty Workspace");
+  buttons[7] = new Button(10, 10, "Menu");
+  /*  buttons[0] = new Button(10, 10, "Node Hinzufügen");
+   buttons[1] = new Button(155, 10, "Löschen");
+   buttons[2] = new Button(10, 50, "Farben umkehren");
+   buttons[3] = new Button(10, 90, "Speichern");
+   buttons[4] = new Button(10, 130, "Öffnen");
+   buttons[5] = new Button(10, 170, "Bild Exportieren");
+   buttons[6] = new Button(10, 210, "Arbeitsfläche leeren");
+   buttons[7] = new Button(10, 210, "Menü");*/
 }
 
 public void buttonFunctions(int functionID) {
@@ -137,6 +162,12 @@ public void buttonFunctions(int functionID) {
     case(5):
     selectOutput("Where to export .png image file to?", "savePNGFile");
     break;
+    case(6):
+    deleteAll();
+    break;
+    case(7):
+    menu();
+    break;
   default:
     break;
   }
@@ -175,6 +206,15 @@ class Button {
     text(label, x+9, y+h/2+5);
   }
 }
+
+boolean menuOpen;
+
+public void menu() {
+  if (menuOpen) {
+  } else {
+  }
+  menuOpen = !menuOpen;
+}
 int linkCount;
 
 boolean dragLink; //state of dragging a link
@@ -364,7 +404,6 @@ class Node {
     text(title, x, y+textSize/3);
   }
 }
-
 /**
  * Saving and loading is a messy hack!
  * You'll get a blank line in your save file for each deleted object.
@@ -390,17 +429,7 @@ public void loadCSVFile(File selection) {
 }
 
 public void loadCSV(String path) {
-  for (int i = 0; i < nodeCount; i++) {
-    //nodes[i].deleted = true;
-    i_selectedNode = i;
-    deleteSelectedNode();
-  }
-  nodeCount = 0;
-
-  for (int i = 0; i < linkCount; i++) {
-    links[i].active = false;
-  }
-  linkCount = 0;
+  deleteAll();
 
   String[] loadString = loadStrings(path);
   for (int i = 0; i < loadString.length-1; i++) {
@@ -439,12 +468,12 @@ public void saveCSV(String path) {
   String[] saveArray = split(saveString, '\n');
   saveStrings(path, saveArray);
 }
-
 /**
  * Keys only get caught for changing a nodes title.
  * Previous title is remembered in savedTitle and restored when hitting Escape
  */
 String savedTitle;
+
 public void keyPressed() {
   if (key == ESC) {
     key = 0;
@@ -564,7 +593,6 @@ public void mouseWheel(MouseEvent event) {
     nodes[i].setVectors();
   }
 }
-
   public void settings() {  size(800, 600); }
   static public void main(String[] passedArgs) {
     String[] appletArgs = new String[] { "ontology" };
diff --git a/build/application.linux-arm64/source/ontology.pde b/build/application.linux-arm64/source/ontology.pde
index 07edee4..41227fc 100644
--- a/build/application.linux-arm64/source/ontology.pde
+++ b/build/application.linux-arm64/source/ontology.pde
@@ -7,11 +7,12 @@ boolean darkMode = true;
 void setup() {
   size(800, 600);
   surface.setResizable(true);
+  //frame.setResizable(true);
 
   textSize(textSize);
 
   initButtons();
-  
+
   /**
    * When saving, a copy of the save-file is stored locally which is opened when starting the program
    */
@@ -56,10 +57,14 @@ void draw() {
     textAlign(CORNER);
     buttons[0].display();
     if (i_selectedNode != -1) buttons[1].display();
-    buttons[2].display();
-    buttons[3].display();
-    buttons[4].display();
-    buttons[5].display();
+    if (menuOpen) {
+      buttons[2].display();
+      buttons[3].display();
+      buttons[4].display();
+      buttons[5].display();
+      buttons[6].display();
+    }
+    buttons[7].display();
     rectMode(CENTER);
     textAlign(CENTER);
     textSize(textSize);
@@ -81,3 +86,16 @@ void draw() {
     }
   }
 }
+
+void deleteAll() {
+  for (int i = 0; i < nodeCount; i++) {
+    //nodes[i].deleted = true;
+    i_selectedNode = i;
+    deleteSelectedNode();
+  }
+  nodeCount = 0;
+  for (int i = 0; i < linkCount; i++) {
+    links[i].active = false;
+  }
+  linkCount = 0;
+}
diff --git a/build/application.linux-arm64/source/save_load.pde b/build/application.linux-arm64/source/save_load.pde
index eb7501b..d261652 100644
--- a/build/application.linux-arm64/source/save_load.pde
+++ b/build/application.linux-arm64/source/save_load.pde
@@ -23,17 +23,7 @@ void loadCSVFile(File selection) {
 }
 
 void loadCSV(String path) {
-  for (int i = 0; i < nodeCount; i++) {
-    //nodes[i].deleted = true;
-    i_selectedNode = i;
-    deleteSelectedNode();
-  }
-  nodeCount = 0;
-
-  for (int i = 0; i < linkCount; i++) {
-    links[i].active = false;
-  }
-  linkCount = 0;
+  deleteAll();
 
   String[] loadString = loadStrings(path);
   for (int i = 0; i < loadString.length-1; i++) {
diff --git a/build/application.linux-arm64/source/ui.pde b/build/application.linux-arm64/source/ui.pde
index 67f9b3a..ea86ca1 100644
--- a/build/application.linux-arm64/source/ui.pde
+++ b/build/application.linux-arm64/source/ui.pde
@@ -3,6 +3,7 @@
  * Previous title is remembered in savedTitle and restored when hitting Escape
  */
 String savedTitle;
+
 void keyPressed() {
   if (key == ESC) {
     key = 0;
diff --git a/build/application.linux-armv6hf/data/save.csv b/build/application.linux-armv6hf/data/save.csv
index 4ed18e7..139597f 100644
--- a/build/application.linux-armv6hf/data/save.csv
+++ b/build/application.linux-armv6hf/data/save.csv
@@ -1,43 +1,2 @@
 
 
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-Biological Process,395,537,32,33
-Physiological Process,292,455,34
-Cellular Process,483,455,34
-Cellular Physiological Process,391,375,36,35
-Cell Cycle,305,296,40,41
-Cell Division,544,265,37
-Cytokinesis,543,165,38
-Cytokinesis after Meiosis,399,54
-M Phase of Meiotic Cell Cycle,310,144,38
-M Phase,239,225,39
-Meiotic Cell Cycle,392,225,39
-
diff --git a/build/application.linux-armv6hf/lib/ontology.jar b/build/application.linux-armv6hf/lib/ontology.jar
index 8379e9f..f218851 100644
Binary files a/build/application.linux-armv6hf/lib/ontology.jar and b/build/application.linux-armv6hf/lib/ontology.jar differ
diff --git a/build/application.linux-armv6hf/source/buttons.pde b/build/application.linux-armv6hf/source/gui.pde
similarity index 63%
rename from build/application.linux-armv6hf/source/buttons.pde
rename to build/application.linux-armv6hf/source/gui.pde
index 525ddb1..4b9de3a 100644
--- a/build/application.linux-armv6hf/source/buttons.pde
+++ b/build/application.linux-armv6hf/source/gui.pde
@@ -1,19 +1,26 @@
-int buttonCount = 6;
+int buttonCount = 8;
 int i_buttonId;
 
+
+
+
 void initButtons() {
-  buttons[0] = new Button(10, 10, "Add Node");
-  buttons[1] = new Button(104, 10, "Delete Node");
+  buttons[0] = new Button(72, 10, "Add Node");
+  buttons[1] = new Button(164, 10, "Delete Node");
   buttons[2] = new Button(10, 50, "Dark/Bright Mode");
   buttons[3] = new Button(10, 90, "Save");
   buttons[4] = new Button(10, 130, "Open");
   buttons[5] = new Button(10, 170, "Export Image");
-/*  buttons[0] = new Button(10, 10, "Node Hinzufügen");
-  buttons[1] = new Button(155, 10, "Löschen");
-  buttons[2] = new Button(10, 50, "Farben umkehren");
-  buttons[3] = new Button(10, 90, "Speichern");
-  buttons[4] = new Button(10, 130, "Öffnen");
-  buttons[5] = new Button(10, 170, "Bild Exportieren");*/
+  buttons[6] = new Button(10, 210, "Empty Workspace");
+  buttons[7] = new Button(10, 10, "Menu");
+  /*  buttons[0] = new Button(10, 10, "Node Hinzufügen");
+   buttons[1] = new Button(155, 10, "Löschen");
+   buttons[2] = new Button(10, 50, "Farben umkehren");
+   buttons[3] = new Button(10, 90, "Speichern");
+   buttons[4] = new Button(10, 130, "Öffnen");
+   buttons[5] = new Button(10, 170, "Bild Exportieren");
+   buttons[6] = new Button(10, 210, "Arbeitsfläche leeren");
+   buttons[7] = new Button(10, 210, "Menü");*/
 }
 
 void buttonFunctions(int functionID) {
@@ -38,6 +45,12 @@ void buttonFunctions(int functionID) {
     case(5):
     selectOutput("Where to export .png image file to?", "savePNGFile");
     break;
+    case(6):
+    deleteAll();
+    break;
+    case(7):
+    menu();
+    break;
   default:
     break;
   }
@@ -76,3 +89,12 @@ class Button {
     text(label, x+9, y+h/2+5);
   }
 }
+
+boolean menuOpen;
+
+void menu() {
+  if (menuOpen) {
+  } else {
+  }
+  menuOpen = !menuOpen;
+}
diff --git a/build/application.linux-armv6hf/source/ontology.java b/build/application.linux-armv6hf/source/ontology.java
index f7bfd3a..cf773f7 100644
--- a/build/application.linux-armv6hf/source/ontology.java
+++ b/build/application.linux-armv6hf/source/ontology.java
@@ -23,11 +23,12 @@ boolean darkMode = true;
 public void setup() {
   
   surface.setResizable(true);
+  //frame.setResizable(true);
 
   textSize(textSize);
 
   initButtons();
-  
+
   /**
    * When saving, a copy of the save-file is stored locally which is opened when starting the program
    */
@@ -72,10 +73,14 @@ public void draw() {
     textAlign(CORNER);
     buttons[0].display();
     if (i_selectedNode != -1) buttons[1].display();
-    buttons[2].display();
-    buttons[3].display();
-    buttons[4].display();
-    buttons[5].display();
+    if (menuOpen) {
+      buttons[2].display();
+      buttons[3].display();
+      buttons[4].display();
+      buttons[5].display();
+      buttons[6].display();
+    }
+    buttons[7].display();
     rectMode(CENTER);
     textAlign(CENTER);
     textSize(textSize);
@@ -97,22 +102,42 @@ public void draw() {
     }
   }
 }
-int buttonCount = 6;
+
+public void deleteAll() {
+  for (int i = 0; i < nodeCount; i++) {
+    //nodes[i].deleted = true;
+    i_selectedNode = i;
+    deleteSelectedNode();
+  }
+  nodeCount = 0;
+  for (int i = 0; i < linkCount; i++) {
+    links[i].active = false;
+  }
+  linkCount = 0;
+}
+int buttonCount = 8;
 int i_buttonId;
 
+
+
+
 public void initButtons() {
-  buttons[0] = new Button(10, 10, "Add Node");
-  buttons[1] = new Button(104, 10, "Delete Node");
+  buttons[0] = new Button(72, 10, "Add Node");
+  buttons[1] = new Button(164, 10, "Delete Node");
   buttons[2] = new Button(10, 50, "Dark/Bright Mode");
   buttons[3] = new Button(10, 90, "Save");
   buttons[4] = new Button(10, 130, "Open");
   buttons[5] = new Button(10, 170, "Export Image");
-/*  buttons[0] = new Button(10, 10, "Node Hinzufügen");
-  buttons[1] = new Button(155, 10, "Löschen");
-  buttons[2] = new Button(10, 50, "Farben umkehren");
-  buttons[3] = new Button(10, 90, "Speichern");
-  buttons[4] = new Button(10, 130, "Öffnen");
-  buttons[5] = new Button(10, 170, "Bild Exportieren");*/
+  buttons[6] = new Button(10, 210, "Empty Workspace");
+  buttons[7] = new Button(10, 10, "Menu");
+  /*  buttons[0] = new Button(10, 10, "Node Hinzufügen");
+   buttons[1] = new Button(155, 10, "Löschen");
+   buttons[2] = new Button(10, 50, "Farben umkehren");
+   buttons[3] = new Button(10, 90, "Speichern");
+   buttons[4] = new Button(10, 130, "Öffnen");
+   buttons[5] = new Button(10, 170, "Bild Exportieren");
+   buttons[6] = new Button(10, 210, "Arbeitsfläche leeren");
+   buttons[7] = new Button(10, 210, "Menü");*/
 }
 
 public void buttonFunctions(int functionID) {
@@ -137,6 +162,12 @@ public void buttonFunctions(int functionID) {
     case(5):
     selectOutput("Where to export .png image file to?", "savePNGFile");
     break;
+    case(6):
+    deleteAll();
+    break;
+    case(7):
+    menu();
+    break;
   default:
     break;
   }
@@ -175,6 +206,15 @@ class Button {
     text(label, x+9, y+h/2+5);
   }
 }
+
+boolean menuOpen;
+
+public void menu() {
+  if (menuOpen) {
+  } else {
+  }
+  menuOpen = !menuOpen;
+}
 int linkCount;
 
 boolean dragLink; //state of dragging a link
@@ -364,7 +404,6 @@ class Node {
     text(title, x, y+textSize/3);
   }
 }
-
 /**
  * Saving and loading is a messy hack!
  * You'll get a blank line in your save file for each deleted object.
@@ -390,17 +429,7 @@ public void loadCSVFile(File selection) {
 }
 
 public void loadCSV(String path) {
-  for (int i = 0; i < nodeCount; i++) {
-    //nodes[i].deleted = true;
-    i_selectedNode = i;
-    deleteSelectedNode();
-  }
-  nodeCount = 0;
-
-  for (int i = 0; i < linkCount; i++) {
-    links[i].active = false;
-  }
-  linkCount = 0;
+  deleteAll();
 
   String[] loadString = loadStrings(path);
   for (int i = 0; i < loadString.length-1; i++) {
@@ -439,12 +468,12 @@ public void saveCSV(String path) {
   String[] saveArray = split(saveString, '\n');
   saveStrings(path, saveArray);
 }
-
 /**
  * Keys only get caught for changing a nodes title.
  * Previous title is remembered in savedTitle and restored when hitting Escape
  */
 String savedTitle;
+
 public void keyPressed() {
   if (key == ESC) {
     key = 0;
@@ -564,7 +593,6 @@ public void mouseWheel(MouseEvent event) {
     nodes[i].setVectors();
   }
 }
-
   public void settings() {  size(800, 600); }
   static public void main(String[] passedArgs) {
     String[] appletArgs = new String[] { "ontology" };
diff --git a/build/application.linux-armv6hf/source/ontology.pde b/build/application.linux-armv6hf/source/ontology.pde
index 07edee4..41227fc 100644
--- a/build/application.linux-armv6hf/source/ontology.pde
+++ b/build/application.linux-armv6hf/source/ontology.pde
@@ -7,11 +7,12 @@ boolean darkMode = true;
 void setup() {
   size(800, 600);
   surface.setResizable(true);
+  //frame.setResizable(true);
 
   textSize(textSize);
 
   initButtons();
-  
+
   /**
    * When saving, a copy of the save-file is stored locally which is opened when starting the program
    */
@@ -56,10 +57,14 @@ void draw() {
     textAlign(CORNER);
     buttons[0].display();
     if (i_selectedNode != -1) buttons[1].display();
-    buttons[2].display();
-    buttons[3].display();
-    buttons[4].display();
-    buttons[5].display();
+    if (menuOpen) {
+      buttons[2].display();
+      buttons[3].display();
+      buttons[4].display();
+      buttons[5].display();
+      buttons[6].display();
+    }
+    buttons[7].display();
     rectMode(CENTER);
     textAlign(CENTER);
     textSize(textSize);
@@ -81,3 +86,16 @@ void draw() {
     }
   }
 }
+
+void deleteAll() {
+  for (int i = 0; i < nodeCount; i++) {
+    //nodes[i].deleted = true;
+    i_selectedNode = i;
+    deleteSelectedNode();
+  }
+  nodeCount = 0;
+  for (int i = 0; i < linkCount; i++) {
+    links[i].active = false;
+  }
+  linkCount = 0;
+}
diff --git a/build/application.linux-armv6hf/source/save_load.pde b/build/application.linux-armv6hf/source/save_load.pde
index eb7501b..d261652 100644
--- a/build/application.linux-armv6hf/source/save_load.pde
+++ b/build/application.linux-armv6hf/source/save_load.pde
@@ -23,17 +23,7 @@ void loadCSVFile(File selection) {
 }
 
 void loadCSV(String path) {
-  for (int i = 0; i < nodeCount; i++) {
-    //nodes[i].deleted = true;
-    i_selectedNode = i;
-    deleteSelectedNode();
-  }
-  nodeCount = 0;
-
-  for (int i = 0; i < linkCount; i++) {
-    links[i].active = false;
-  }
-  linkCount = 0;
+  deleteAll();
 
   String[] loadString = loadStrings(path);
   for (int i = 0; i < loadString.length-1; i++) {
diff --git a/build/application.linux-armv6hf/source/ui.pde b/build/application.linux-armv6hf/source/ui.pde
index 67f9b3a..ea86ca1 100644
--- a/build/application.linux-armv6hf/source/ui.pde
+++ b/build/application.linux-armv6hf/source/ui.pde
@@ -3,6 +3,7 @@
  * Previous title is remembered in savedTitle and restored when hitting Escape
  */
 String savedTitle;
+
 void keyPressed() {
   if (key == ESC) {
     key = 0;
diff --git a/build/application.linux32/data/save.csv b/build/application.linux32/data/save.csv
index 4ed18e7..139597f 100644
--- a/build/application.linux32/data/save.csv
+++ b/build/application.linux32/data/save.csv
@@ -1,43 +1,2 @@
 
 
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-Biological Process,395,537,32,33
-Physiological Process,292,455,34
-Cellular Process,483,455,34
-Cellular Physiological Process,391,375,36,35
-Cell Cycle,305,296,40,41
-Cell Division,544,265,37
-Cytokinesis,543,165,38
-Cytokinesis after Meiosis,399,54
-M Phase of Meiotic Cell Cycle,310,144,38
-M Phase,239,225,39
-Meiotic Cell Cycle,392,225,39
-
diff --git a/build/application.linux32/lib/ontology.jar b/build/application.linux32/lib/ontology.jar
index 8379e9f..f218851 100644
Binary files a/build/application.linux32/lib/ontology.jar and b/build/application.linux32/lib/ontology.jar differ
diff --git a/build/application.linux32/source/buttons.pde b/build/application.linux32/source/gui.pde
similarity index 63%
rename from build/application.linux32/source/buttons.pde
rename to build/application.linux32/source/gui.pde
index 525ddb1..4b9de3a 100644
--- a/build/application.linux32/source/buttons.pde
+++ b/build/application.linux32/source/gui.pde
@@ -1,19 +1,26 @@
-int buttonCount = 6;
+int buttonCount = 8;
 int i_buttonId;
 
+
+
+
 void initButtons() {
-  buttons[0] = new Button(10, 10, "Add Node");
-  buttons[1] = new Button(104, 10, "Delete Node");
+  buttons[0] = new Button(72, 10, "Add Node");
+  buttons[1] = new Button(164, 10, "Delete Node");
   buttons[2] = new Button(10, 50, "Dark/Bright Mode");
   buttons[3] = new Button(10, 90, "Save");
   buttons[4] = new Button(10, 130, "Open");
   buttons[5] = new Button(10, 170, "Export Image");
-/*  buttons[0] = new Button(10, 10, "Node Hinzufügen");
-  buttons[1] = new Button(155, 10, "Löschen");
-  buttons[2] = new Button(10, 50, "Farben umkehren");
-  buttons[3] = new Button(10, 90, "Speichern");
-  buttons[4] = new Button(10, 130, "Öffnen");
-  buttons[5] = new Button(10, 170, "Bild Exportieren");*/
+  buttons[6] = new Button(10, 210, "Empty Workspace");
+  buttons[7] = new Button(10, 10, "Menu");
+  /*  buttons[0] = new Button(10, 10, "Node Hinzufügen");
+   buttons[1] = new Button(155, 10, "Löschen");
+   buttons[2] = new Button(10, 50, "Farben umkehren");
+   buttons[3] = new Button(10, 90, "Speichern");
+   buttons[4] = new Button(10, 130, "Öffnen");
+   buttons[5] = new Button(10, 170, "Bild Exportieren");
+   buttons[6] = new Button(10, 210, "Arbeitsfläche leeren");
+   buttons[7] = new Button(10, 210, "Menü");*/
 }
 
 void buttonFunctions(int functionID) {
@@ -38,6 +45,12 @@ void buttonFunctions(int functionID) {
     case(5):
     selectOutput("Where to export .png image file to?", "savePNGFile");
     break;
+    case(6):
+    deleteAll();
+    break;
+    case(7):
+    menu();
+    break;
   default:
     break;
   }
@@ -76,3 +89,12 @@ class Button {
     text(label, x+9, y+h/2+5);
   }
 }
+
+boolean menuOpen;
+
+void menu() {
+  if (menuOpen) {
+  } else {
+  }
+  menuOpen = !menuOpen;
+}
diff --git a/build/application.linux32/source/ontology.java b/build/application.linux32/source/ontology.java
index f7bfd3a..cf773f7 100644
--- a/build/application.linux32/source/ontology.java
+++ b/build/application.linux32/source/ontology.java
@@ -23,11 +23,12 @@ boolean darkMode = true;
 public void setup() {
   
   surface.setResizable(true);
+  //frame.setResizable(true);
 
   textSize(textSize);
 
   initButtons();
-  
+
   /**
    * When saving, a copy of the save-file is stored locally which is opened when starting the program
    */
@@ -72,10 +73,14 @@ public void draw() {
     textAlign(CORNER);
     buttons[0].display();
     if (i_selectedNode != -1) buttons[1].display();
-    buttons[2].display();
-    buttons[3].display();
-    buttons[4].display();
-    buttons[5].display();
+    if (menuOpen) {
+      buttons[2].display();
+      buttons[3].display();
+      buttons[4].display();
+      buttons[5].display();
+      buttons[6].display();
+    }
+    buttons[7].display();
     rectMode(CENTER);
     textAlign(CENTER);
     textSize(textSize);
@@ -97,22 +102,42 @@ public void draw() {
     }
   }
 }
-int buttonCount = 6;
+
+public void deleteAll() {
+  for (int i = 0; i < nodeCount; i++) {
+    //nodes[i].deleted = true;
+    i_selectedNode = i;
+    deleteSelectedNode();
+  }
+  nodeCount = 0;
+  for (int i = 0; i < linkCount; i++) {
+    links[i].active = false;
+  }
+  linkCount = 0;
+}
+int buttonCount = 8;
 int i_buttonId;
 
+
+
+
 public void initButtons() {
-  buttons[0] = new Button(10, 10, "Add Node");
-  buttons[1] = new Button(104, 10, "Delete Node");
+  buttons[0] = new Button(72, 10, "Add Node");
+  buttons[1] = new Button(164, 10, "Delete Node");
   buttons[2] = new Button(10, 50, "Dark/Bright Mode");
   buttons[3] = new Button(10, 90, "Save");
   buttons[4] = new Button(10, 130, "Open");
   buttons[5] = new Button(10, 170, "Export Image");
-/*  buttons[0] = new Button(10, 10, "Node Hinzufügen");
-  buttons[1] = new Button(155, 10, "Löschen");
-  buttons[2] = new Button(10, 50, "Farben umkehren");
-  buttons[3] = new Button(10, 90, "Speichern");
-  buttons[4] = new Button(10, 130, "Öffnen");
-  buttons[5] = new Button(10, 170, "Bild Exportieren");*/
+  buttons[6] = new Button(10, 210, "Empty Workspace");
+  buttons[7] = new Button(10, 10, "Menu");
+  /*  buttons[0] = new Button(10, 10, "Node Hinzufügen");
+   buttons[1] = new Button(155, 10, "Löschen");
+   buttons[2] = new Button(10, 50, "Farben umkehren");
+   buttons[3] = new Button(10, 90, "Speichern");
+   buttons[4] = new Button(10, 130, "Öffnen");
+   buttons[5] = new Button(10, 170, "Bild Exportieren");
+   buttons[6] = new Button(10, 210, "Arbeitsfläche leeren");
+   buttons[7] = new Button(10, 210, "Menü");*/
 }
 
 public void buttonFunctions(int functionID) {
@@ -137,6 +162,12 @@ public void buttonFunctions(int functionID) {
     case(5):
     selectOutput("Where to export .png image file to?", "savePNGFile");
     break;
+    case(6):
+    deleteAll();
+    break;
+    case(7):
+    menu();
+    break;
   default:
     break;
   }
@@ -175,6 +206,15 @@ class Button {
     text(label, x+9, y+h/2+5);
   }
 }
+
+boolean menuOpen;
+
+public void menu() {
+  if (menuOpen) {
+  } else {
+  }
+  menuOpen = !menuOpen;
+}
 int linkCount;
 
 boolean dragLink; //state of dragging a link
@@ -364,7 +404,6 @@ class Node {
     text(title, x, y+textSize/3);
   }
 }
-
 /**
  * Saving and loading is a messy hack!
  * You'll get a blank line in your save file for each deleted object.
@@ -390,17 +429,7 @@ public void loadCSVFile(File selection) {
 }
 
 public void loadCSV(String path) {
-  for (int i = 0; i < nodeCount; i++) {
-    //nodes[i].deleted = true;
-    i_selectedNode = i;
-    deleteSelectedNode();
-  }
-  nodeCount = 0;
-
-  for (int i = 0; i < linkCount; i++) {
-    links[i].active = false;
-  }
-  linkCount = 0;
+  deleteAll();
 
   String[] loadString = loadStrings(path);
   for (int i = 0; i < loadString.length-1; i++) {
@@ -439,12 +468,12 @@ public void saveCSV(String path) {
   String[] saveArray = split(saveString, '\n');
   saveStrings(path, saveArray);
 }
-
 /**
  * Keys only get caught for changing a nodes title.
  * Previous title is remembered in savedTitle and restored when hitting Escape
  */
 String savedTitle;
+
 public void keyPressed() {
   if (key == ESC) {
     key = 0;
@@ -564,7 +593,6 @@ public void mouseWheel(MouseEvent event) {
     nodes[i].setVectors();
   }
 }
-
   public void settings() {  size(800, 600); }
   static public void main(String[] passedArgs) {
     String[] appletArgs = new String[] { "ontology" };
diff --git a/build/application.linux32/source/ontology.pde b/build/application.linux32/source/ontology.pde
index 07edee4..41227fc 100644
--- a/build/application.linux32/source/ontology.pde
+++ b/build/application.linux32/source/ontology.pde
@@ -7,11 +7,12 @@ boolean darkMode = true;
 void setup() {
   size(800, 600);
   surface.setResizable(true);
+  //frame.setResizable(true);
 
   textSize(textSize);
 
   initButtons();
-  
+
   /**
    * When saving, a copy of the save-file is stored locally which is opened when starting the program
    */
@@ -56,10 +57,14 @@ void draw() {
     textAlign(CORNER);
     buttons[0].display();
     if (i_selectedNode != -1) buttons[1].display();
-    buttons[2].display();
-    buttons[3].display();
-    buttons[4].display();
-    buttons[5].display();
+    if (menuOpen) {
+      buttons[2].display();
+      buttons[3].display();
+      buttons[4].display();
+      buttons[5].display();
+      buttons[6].display();
+    }
+    buttons[7].display();
     rectMode(CENTER);
     textAlign(CENTER);
     textSize(textSize);
@@ -81,3 +86,16 @@ void draw() {
     }
   }
 }
+
+void deleteAll() {
+  for (int i = 0; i < nodeCount; i++) {
+    //nodes[i].deleted = true;
+    i_selectedNode = i;
+    deleteSelectedNode();
+  }
+  nodeCount = 0;
+  for (int i = 0; i < linkCount; i++) {
+    links[i].active = false;
+  }
+  linkCount = 0;
+}
diff --git a/build/application.linux32/source/save_load.pde b/build/application.linux32/source/save_load.pde
index eb7501b..d261652 100644
--- a/build/application.linux32/source/save_load.pde
+++ b/build/application.linux32/source/save_load.pde
@@ -23,17 +23,7 @@ void loadCSVFile(File selection) {
 }
 
 void loadCSV(String path) {
-  for (int i = 0; i < nodeCount; i++) {
-    //nodes[i].deleted = true;
-    i_selectedNode = i;
-    deleteSelectedNode();
-  }
-  nodeCount = 0;
-
-  for (int i = 0; i < linkCount; i++) {
-    links[i].active = false;
-  }
-  linkCount = 0;
+  deleteAll();
 
   String[] loadString = loadStrings(path);
   for (int i = 0; i < loadString.length-1; i++) {
diff --git a/build/application.linux32/source/ui.pde b/build/application.linux32/source/ui.pde
index 67f9b3a..ea86ca1 100644
--- a/build/application.linux32/source/ui.pde
+++ b/build/application.linux32/source/ui.pde
@@ -3,6 +3,7 @@
  * Previous title is remembered in savedTitle and restored when hitting Escape
  */
 String savedTitle;
+
 void keyPressed() {
   if (key == ESC) {
     key = 0;
diff --git a/build/application.linux64/data/save.csv b/build/application.linux64/data/save.csv
index 4ed18e7..139597f 100644
--- a/build/application.linux64/data/save.csv
+++ b/build/application.linux64/data/save.csv
@@ -1,43 +1,2 @@
 
 
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-Biological Process,395,537,32,33
-Physiological Process,292,455,34
-Cellular Process,483,455,34
-Cellular Physiological Process,391,375,36,35
-Cell Cycle,305,296,40,41
-Cell Division,544,265,37
-Cytokinesis,543,165,38
-Cytokinesis after Meiosis,399,54
-M Phase of Meiotic Cell Cycle,310,144,38
-M Phase,239,225,39
-Meiotic Cell Cycle,392,225,39
-
diff --git a/build/application.linux64/lib/ontology.jar b/build/application.linux64/lib/ontology.jar
index 8379e9f..f218851 100644
Binary files a/build/application.linux64/lib/ontology.jar and b/build/application.linux64/lib/ontology.jar differ
diff --git a/build/application.linux64/source/buttons.pde b/build/application.linux64/source/gui.pde
similarity index 63%
rename from build/application.linux64/source/buttons.pde
rename to build/application.linux64/source/gui.pde
index 525ddb1..4b9de3a 100644
--- a/build/application.linux64/source/buttons.pde
+++ b/build/application.linux64/source/gui.pde
@@ -1,19 +1,26 @@
-int buttonCount = 6;
+int buttonCount = 8;
 int i_buttonId;
 
+
+
+
 void initButtons() {
-  buttons[0] = new Button(10, 10, "Add Node");
-  buttons[1] = new Button(104, 10, "Delete Node");
+  buttons[0] = new Button(72, 10, "Add Node");
+  buttons[1] = new Button(164, 10, "Delete Node");
   buttons[2] = new Button(10, 50, "Dark/Bright Mode");
   buttons[3] = new Button(10, 90, "Save");
   buttons[4] = new Button(10, 130, "Open");
   buttons[5] = new Button(10, 170, "Export Image");
-/*  buttons[0] = new Button(10, 10, "Node Hinzufügen");
-  buttons[1] = new Button(155, 10, "Löschen");
-  buttons[2] = new Button(10, 50, "Farben umkehren");
-  buttons[3] = new Button(10, 90, "Speichern");
-  buttons[4] = new Button(10, 130, "Öffnen");
-  buttons[5] = new Button(10, 170, "Bild Exportieren");*/
+  buttons[6] = new Button(10, 210, "Empty Workspace");
+  buttons[7] = new Button(10, 10, "Menu");
+  /*  buttons[0] = new Button(10, 10, "Node Hinzufügen");
+   buttons[1] = new Button(155, 10, "Löschen");
+   buttons[2] = new Button(10, 50, "Farben umkehren");
+   buttons[3] = new Button(10, 90, "Speichern");
+   buttons[4] = new Button(10, 130, "Öffnen");
+   buttons[5] = new Button(10, 170, "Bild Exportieren");
+   buttons[6] = new Button(10, 210, "Arbeitsfläche leeren");
+   buttons[7] = new Button(10, 210, "Menü");*/
 }
 
 void buttonFunctions(int functionID) {
@@ -38,6 +45,12 @@ void buttonFunctions(int functionID) {
     case(5):
     selectOutput("Where to export .png image file to?", "savePNGFile");
     break;
+    case(6):
+    deleteAll();
+    break;
+    case(7):
+    menu();
+    break;
   default:
     break;
   }
@@ -76,3 +89,12 @@ class Button {
     text(label, x+9, y+h/2+5);
   }
 }
+
+boolean menuOpen;
+
+void menu() {
+  if (menuOpen) {
+  } else {
+  }
+  menuOpen = !menuOpen;
+}
diff --git a/build/application.linux64/source/ontology.java b/build/application.linux64/source/ontology.java
index f7bfd3a..cf773f7 100644
--- a/build/application.linux64/source/ontology.java
+++ b/build/application.linux64/source/ontology.java
@@ -23,11 +23,12 @@ boolean darkMode = true;
 public void setup() {
   
   surface.setResizable(true);
+  //frame.setResizable(true);
 
   textSize(textSize);
 
   initButtons();
-  
+
   /**
    * When saving, a copy of the save-file is stored locally which is opened when starting the program
    */
@@ -72,10 +73,14 @@ public void draw() {
     textAlign(CORNER);
     buttons[0].display();
     if (i_selectedNode != -1) buttons[1].display();
-    buttons[2].display();
-    buttons[3].display();
-    buttons[4].display();
-    buttons[5].display();
+    if (menuOpen) {
+      buttons[2].display();
+      buttons[3].display();
+      buttons[4].display();
+      buttons[5].display();
+      buttons[6].display();
+    }
+    buttons[7].display();
     rectMode(CENTER);
     textAlign(CENTER);
     textSize(textSize);
@@ -97,22 +102,42 @@ public void draw() {
     }
   }
 }
-int buttonCount = 6;
+
+public void deleteAll() {
+  for (int i = 0; i < nodeCount; i++) {
+    //nodes[i].deleted = true;
+    i_selectedNode = i;
+    deleteSelectedNode();
+  }
+  nodeCount = 0;
+  for (int i = 0; i < linkCount; i++) {
+    links[i].active = false;
+  }
+  linkCount = 0;
+}
+int buttonCount = 8;
 int i_buttonId;
 
+
+
+
 public void initButtons() {
-  buttons[0] = new Button(10, 10, "Add Node");
-  buttons[1] = new Button(104, 10, "Delete Node");
+  buttons[0] = new Button(72, 10, "Add Node");
+  buttons[1] = new Button(164, 10, "Delete Node");
   buttons[2] = new Button(10, 50, "Dark/Bright Mode");
   buttons[3] = new Button(10, 90, "Save");
   buttons[4] = new Button(10, 130, "Open");
   buttons[5] = new Button(10, 170, "Export Image");
-/*  buttons[0] = new Button(10, 10, "Node Hinzufügen");
-  buttons[1] = new Button(155, 10, "Löschen");
-  buttons[2] = new Button(10, 50, "Farben umkehren");
-  buttons[3] = new Button(10, 90, "Speichern");
-  buttons[4] = new Button(10, 130, "Öffnen");
-  buttons[5] = new Button(10, 170, "Bild Exportieren");*/
+  buttons[6] = new Button(10, 210, "Empty Workspace");
+  buttons[7] = new Button(10, 10, "Menu");
+  /*  buttons[0] = new Button(10, 10, "Node Hinzufügen");
+   buttons[1] = new Button(155, 10, "Löschen");
+   buttons[2] = new Button(10, 50, "Farben umkehren");
+   buttons[3] = new Button(10, 90, "Speichern");
+   buttons[4] = new Button(10, 130, "Öffnen");
+   buttons[5] = new Button(10, 170, "Bild Exportieren");
+   buttons[6] = new Button(10, 210, "Arbeitsfläche leeren");
+   buttons[7] = new Button(10, 210, "Menü");*/
 }
 
 public void buttonFunctions(int functionID) {
@@ -137,6 +162,12 @@ public void buttonFunctions(int functionID) {
     case(5):
     selectOutput("Where to export .png image file to?", "savePNGFile");
     break;
+    case(6):
+    deleteAll();
+    break;
+    case(7):
+    menu();
+    break;
   default:
     break;
   }
@@ -175,6 +206,15 @@ class Button {
     text(label, x+9, y+h/2+5);
   }
 }
+
+boolean menuOpen;
+
+public void menu() {
+  if (menuOpen) {
+  } else {
+  }
+  menuOpen = !menuOpen;
+}
 int linkCount;
 
 boolean dragLink; //state of dragging a link
@@ -364,7 +404,6 @@ class Node {
     text(title, x, y+textSize/3);
   }
 }
-
 /**
  * Saving and loading is a messy hack!
  * You'll get a blank line in your save file for each deleted object.
@@ -390,17 +429,7 @@ public void loadCSVFile(File selection) {
 }
 
 public void loadCSV(String path) {
-  for (int i = 0; i < nodeCount; i++) {
-    //nodes[i].deleted = true;
-    i_selectedNode = i;
-    deleteSelectedNode();
-  }
-  nodeCount = 0;
-
-  for (int i = 0; i < linkCount; i++) {
-    links[i].active = false;
-  }
-  linkCount = 0;
+  deleteAll();
 
   String[] loadString = loadStrings(path);
   for (int i = 0; i < loadString.length-1; i++) {
@@ -439,12 +468,12 @@ public void saveCSV(String path) {
   String[] saveArray = split(saveString, '\n');
   saveStrings(path, saveArray);
 }
-
 /**
  * Keys only get caught for changing a nodes title.
  * Previous title is remembered in savedTitle and restored when hitting Escape
  */
 String savedTitle;
+
 public void keyPressed() {
   if (key == ESC) {
     key = 0;
@@ -564,7 +593,6 @@ public void mouseWheel(MouseEvent event) {
     nodes[i].setVectors();
   }
 }
-
   public void settings() {  size(800, 600); }
   static public void main(String[] passedArgs) {
     String[] appletArgs = new String[] { "ontology" };
diff --git a/build/application.linux64/source/ontology.pde b/build/application.linux64/source/ontology.pde
index 07edee4..41227fc 100644
--- a/build/application.linux64/source/ontology.pde
+++ b/build/application.linux64/source/ontology.pde
@@ -7,11 +7,12 @@ boolean darkMode = true;
 void setup() {
   size(800, 600);
   surface.setResizable(true);
+  //frame.setResizable(true);
 
   textSize(textSize);
 
   initButtons();
-  
+
   /**
    * When saving, a copy of the save-file is stored locally which is opened when starting the program
    */
@@ -56,10 +57,14 @@ void draw() {
     textAlign(CORNER);
     buttons[0].display();
     if (i_selectedNode != -1) buttons[1].display();
-    buttons[2].display();
-    buttons[3].display();
-    buttons[4].display();
-    buttons[5].display();
+    if (menuOpen) {
+      buttons[2].display();
+      buttons[3].display();
+      buttons[4].display();
+      buttons[5].display();
+      buttons[6].display();
+    }
+    buttons[7].display();
     rectMode(CENTER);
     textAlign(CENTER);
     textSize(textSize);
@@ -81,3 +86,16 @@ void draw() {
     }
   }
 }
+
+void deleteAll() {
+  for (int i = 0; i < nodeCount; i++) {
+    //nodes[i].deleted = true;
+    i_selectedNode = i;
+    deleteSelectedNode();
+  }
+  nodeCount = 0;
+  for (int i = 0; i < linkCount; i++) {
+    links[i].active = false;
+  }
+  linkCount = 0;
+}
diff --git a/build/application.linux64/source/save_load.pde b/build/application.linux64/source/save_load.pde
index eb7501b..d261652 100644
--- a/build/application.linux64/source/save_load.pde
+++ b/build/application.linux64/source/save_load.pde
@@ -23,17 +23,7 @@ void loadCSVFile(File selection) {
 }
 
 void loadCSV(String path) {
-  for (int i = 0; i < nodeCount; i++) {
-    //nodes[i].deleted = true;
-    i_selectedNode = i;
-    deleteSelectedNode();
-  }
-  nodeCount = 0;
-
-  for (int i = 0; i < linkCount; i++) {
-    links[i].active = false;
-  }
-  linkCount = 0;
+  deleteAll();
 
   String[] loadString = loadStrings(path);
   for (int i = 0; i < loadString.length-1; i++) {
diff --git a/build/application.linux64/source/ui.pde b/build/application.linux64/source/ui.pde
index 67f9b3a..ea86ca1 100644
--- a/build/application.linux64/source/ui.pde
+++ b/build/application.linux64/source/ui.pde
@@ -3,6 +3,7 @@
  * Previous title is remembered in savedTitle and restored when hitting Escape
  */
 String savedTitle;
+
 void keyPressed() {
   if (key == ESC) {
     key = 0;
diff --git a/build/application.windows32/data/save.csv b/build/application.windows32/data/save.csv
index 4ed18e7..139597f 100644
--- a/build/application.windows32/data/save.csv
+++ b/build/application.windows32/data/save.csv
@@ -1,43 +1,2 @@
 
 
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-Biological Process,395,537,32,33
-Physiological Process,292,455,34
-Cellular Process,483,455,34
-Cellular Physiological Process,391,375,36,35
-Cell Cycle,305,296,40,41
-Cell Division,544,265,37
-Cytokinesis,543,165,38
-Cytokinesis after Meiosis,399,54
-M Phase of Meiotic Cell Cycle,310,144,38
-M Phase,239,225,39
-Meiotic Cell Cycle,392,225,39
-
diff --git a/build/application.windows32/lib/ontology.jar b/build/application.windows32/lib/ontology.jar
index 8379e9f..f218851 100644
Binary files a/build/application.windows32/lib/ontology.jar and b/build/application.windows32/lib/ontology.jar differ
diff --git a/build/application.windows32/ontology.exe b/build/application.windows32/ontology.exe
index 40790d1..46d29a1 100755
Binary files a/build/application.windows32/ontology.exe and b/build/application.windows32/ontology.exe differ
diff --git a/build/application.windows32/source/buttons.pde b/build/application.windows32/source/buttons.pde
deleted file mode 100644
index 525ddb1..0000000
--- a/build/application.windows32/source/buttons.pde
+++ /dev/null
@@ -1,78 +0,0 @@
-int buttonCount = 6;
-int i_buttonId;
-
-void initButtons() {
-  buttons[0] = new Button(10, 10, "Add Node");
-  buttons[1] = new Button(104, 10, "Delete Node");
-  buttons[2] = new Button(10, 50, "Dark/Bright Mode");
-  buttons[3] = new Button(10, 90, "Save");
-  buttons[4] = new Button(10, 130, "Open");
-  buttons[5] = new Button(10, 170, "Export Image");
-/*  buttons[0] = new Button(10, 10, "Node Hinzufügen");
-  buttons[1] = new Button(155, 10, "Löschen");
-  buttons[2] = new Button(10, 50, "Farben umkehren");
-  buttons[3] = new Button(10, 90, "Speichern");
-  buttons[4] = new Button(10, 130, "Öffnen");
-  buttons[5] = new Button(10, 170, "Bild Exportieren");*/
-}
-
-void buttonFunctions(int functionID) {
-  switch (functionID) {
-    case(0):
-    addNode(int(random(50, width-50)), int(random(30, height-150)), "");
-    i_selectedNode = nodeCount-1;
-    break;
-    case(1):
-    deleteSelectedNode();
-    break;
-    case(2):
-    darkMode = !darkMode;
-    break;
-    case(3):
-    saveCSV(dataPath("save.csv"));
-    selectOutput("Where to save .csv file to?", "saveCSVFile");
-    break;
-    case(4):
-    selectInput("Select csv File", "loadCSVFile");
-    break;
-    case(5):
-    selectOutput("Where to export .png image file to?", "savePNGFile");
-    break;
-  default:
-    break;
-  }
-}
-
-
-Button buttons[] = new Button[buttonCount];
-
-class Button {
-  int id, x, y, w, h;
-  String label;
-
-  boolean hover() {
-    return (mouseX > x && mouseX <  x+w && mouseY > y && mouseY < y+h) ? true : false;
-  }
-
-  void click() {
-    buttonFunctions(id);
-  }
-  Button(int x_, int y_, String label_) {
-    id = i_buttonId;
-    i_buttonId++;
-    x = x_;
-    y = y_ ;
-    label = label_;
-    w = int(textWidth(label))+18;
-    h = 32;
-  }
-
-  void display() {
-    stroke(0);
-    strokeWeight(1);
-    fill(255, 127);
-    rect(x, y, w, h, 4);
-    fill(0);
-    text(label, x+9, y+h/2+5);
-  }
-}
diff --git a/build/application.windows32/source/gui.pde b/build/application.windows32/source/gui.pde
new file mode 100644
index 0000000..4b9de3a
--- /dev/null
+++ b/build/application.windows32/source/gui.pde
@@ -0,0 +1,100 @@
+int buttonCount = 8;
+int i_buttonId;
+
+
+
+
+void initButtons() {
+  buttons[0] = new Button(72, 10, "Add Node");
+  buttons[1] = new Button(164, 10, "Delete Node");
+  buttons[2] = new Button(10, 50, "Dark/Bright Mode");
+  buttons[3] = new Button(10, 90, "Save");
+  buttons[4] = new Button(10, 130, "Open");
+  buttons[5] = new Button(10, 170, "Export Image");
+  buttons[6] = new Button(10, 210, "Empty Workspace");
+  buttons[7] = new Button(10, 10, "Menu");
+  /*  buttons[0] = new Button(10, 10, "Node Hinzufügen");
+   buttons[1] = new Button(155, 10, "Löschen");
+   buttons[2] = new Button(10, 50, "Farben umkehren");
+   buttons[3] = new Button(10, 90, "Speichern");
+   buttons[4] = new Button(10, 130, "Öffnen");
+   buttons[5] = new Button(10, 170, "Bild Exportieren");
+   buttons[6] = new Button(10, 210, "Arbeitsfläche leeren");
+   buttons[7] = new Button(10, 210, "Menü");*/
+}
+
+void buttonFunctions(int functionID) {
+  switch (functionID) {
+    case(0):
+    addNode(int(random(50, width-50)), int(random(30, height-150)), "");
+    i_selectedNode = nodeCount-1;
+    break;
+    case(1):
+    deleteSelectedNode();
+    break;
+    case(2):
+    darkMode = !darkMode;
+    break;
+    case(3):
+    saveCSV(dataPath("save.csv"));
+    selectOutput("Where to save .csv file to?", "saveCSVFile");
+    break;
+    case(4):
+    selectInput("Select csv File", "loadCSVFile");
+    break;
+    case(5):
+    selectOutput("Where to export .png image file to?", "savePNGFile");
+    break;
+    case(6):
+    deleteAll();
+    break;
+    case(7):
+    menu();
+    break;
+  default:
+    break;
+  }
+}
+
+
+Button buttons[] = new Button[buttonCount];
+
+class Button {
+  int id, x, y, w, h;
+  String label;
+
+  boolean hover() {
+    return (mouseX > x && mouseX <  x+w && mouseY > y && mouseY < y+h) ? true : false;
+  }
+
+  void click() {
+    buttonFunctions(id);
+  }
+  Button(int x_, int y_, String label_) {
+    id = i_buttonId;
+    i_buttonId++;
+    x = x_;
+    y = y_ ;
+    label = label_;
+    w = int(textWidth(label))+18;
+    h = 32;
+  }
+
+  void display() {
+    stroke(0);
+    strokeWeight(1);
+    fill(255, 127);
+    rect(x, y, w, h, 4);
+    fill(0);
+    text(label, x+9, y+h/2+5);
+  }
+}
+
+boolean menuOpen;
+
+void menu() {
+  if (menuOpen) {
+  } else {
+  }
+  menuOpen = !menuOpen;
+}
diff --git a/build/application.windows32/source/ontology.java b/build/application.windows32/source/ontology.java
index f7bfd3a..cf773f7 100644
--- a/build/application.windows32/source/ontology.java
+++ b/build/application.windows32/source/ontology.java
@@ -23,11 +23,12 @@ boolean darkMode = true;
 public void setup() {
   
   surface.setResizable(true);
+  //frame.setResizable(true);
 
   textSize(textSize);
 
   initButtons();
-  
+
   /**
    * When saving, a copy of the save-file is stored locally which is opened when starting the program
    */
@@ -72,10 +73,14 @@ public void draw() {
     textAlign(CORNER);
     buttons[0].display();
     if (i_selectedNode != -1) buttons[1].display();
-    buttons[2].display();
-    buttons[3].display();
-    buttons[4].display();
-    buttons[5].display();
+    if (menuOpen) {
+      buttons[2].display();
+      buttons[3].display();
+      buttons[4].display();
+      buttons[5].display();
+      buttons[6].display();
+    }
+    buttons[7].display();
     rectMode(CENTER);
     textAlign(CENTER);
     textSize(textSize);
@@ -97,22 +102,42 @@ public void draw() {
     }
   }
 }
-int buttonCount = 6;
+
+public void deleteAll() {
+  for (int i = 0; i < nodeCount; i++) {
+    //nodes[i].deleted = true;
+    i_selectedNode = i;
+    deleteSelectedNode();
+  }
+  nodeCount = 0;
+  for (int i = 0; i < linkCount; i++) {
+    links[i].active = false;
+  }
+  linkCount = 0;
+}
+int buttonCount = 8;
 int i_buttonId;
 
+
+
+
 public void initButtons() {
-  buttons[0] = new Button(10, 10, "Add Node");
-  buttons[1] = new Button(104, 10, "Delete Node");
+  buttons[0] = new Button(72, 10, "Add Node");
+  buttons[1] = new Button(164, 10, "Delete Node");
   buttons[2] = new Button(10, 50, "Dark/Bright Mode");
   buttons[3] = new Button(10, 90, "Save");
   buttons[4] = new Button(10, 130, "Open");
   buttons[5] = new Button(10, 170, "Export Image");
-/*  buttons[0] = new Button(10, 10, "Node Hinzufügen");
-  buttons[1] = new Button(155, 10, "Löschen");
-  buttons[2] = new Button(10, 50, "Farben umkehren");
-  buttons[3] = new Button(10, 90, "Speichern");
-  buttons[4] = new Button(10, 130, "Öffnen");
-  buttons[5] = new Button(10, 170, "Bild Exportieren");*/
+  buttons[6] = new Button(10, 210, "Empty Workspace");
+  buttons[7] = new Button(10, 10, "Menu");
+  /*  buttons[0] = new Button(10, 10, "Node Hinzufügen");
+   buttons[1] = new Button(155, 10, "Löschen");
+   buttons[2] = new Button(10, 50, "Farben umkehren");
+   buttons[3] = new Button(10, 90, "Speichern");
+   buttons[4] = new Button(10, 130, "Öffnen");
+   buttons[5] = new Button(10, 170, "Bild Exportieren");
+   buttons[6] = new Button(10, 210, "Arbeitsfläche leeren");
+   buttons[7] = new Button(10, 210, "Menü");*/
 }
 
 public void buttonFunctions(int functionID) {
@@ -137,6 +162,12 @@ public void buttonFunctions(int functionID) {
     case(5):
     selectOutput("Where to export .png image file to?", "savePNGFile");
     break;
+    case(6):
+    deleteAll();
+    break;
+    case(7):
+    menu();
+    break;
   default:
     break;
   }
@@ -175,6 +206,15 @@ class Button {
     text(label, x+9, y+h/2+5);
   }
 }
+
+boolean menuOpen;
+
+public void menu() {
+  if (menuOpen) {
+  } else {
+  }
+  menuOpen = !menuOpen;
+}
 int linkCount;
 
 boolean dragLink; //state of dragging a link
@@ -364,7 +404,6 @@ class Node {
     text(title, x, y+textSize/3);
   }
 }
-
 /**
  * Saving and loading is a messy hack!
  * You'll get a blank line in your save file for each deleted object.
@@ -390,17 +429,7 @@ public void loadCSVFile(File selection) {
 }
 
 public void loadCSV(String path) {
-  for (int i = 0; i < nodeCount; i++) {
-    //nodes[i].deleted = true;
-    i_selectedNode = i;
-    deleteSelectedNode();
-  }
-  nodeCount = 0;
-
-  for (int i = 0; i < linkCount; i++) {
-    links[i].active = false;
-  }
-  linkCount = 0;
+  deleteAll();
 
   String[] loadString = loadStrings(path);
   for (int i = 0; i < loadString.length-1; i++) {
@@ -439,12 +468,12 @@ public void saveCSV(String path) {
   String[] saveArray = split(saveString, '\n');
   saveStrings(path, saveArray);
 }
-
 /**
  * Keys only get caught for changing a nodes title.
  * Previous title is remembered in savedTitle and restored when hitting Escape
  */
 String savedTitle;
+
 public void keyPressed() {
   if (key == ESC) {
     key = 0;
@@ -564,7 +593,6 @@ public void mouseWheel(MouseEvent event) {
     nodes[i].setVectors();
   }
 }
-
   public void settings() {  size(800, 600); }
   static public void main(String[] passedArgs) {
     String[] appletArgs = new String[] { "ontology" };
diff --git a/build/application.windows32/source/ontology.pde b/build/application.windows32/source/ontology.pde
index 07edee4..41227fc 100644
--- a/build/application.windows32/source/ontology.pde
+++ b/build/application.windows32/source/ontology.pde
@@ -7,11 +7,12 @@ boolean darkMode = true;
 void setup() {
   size(800, 600);
   surface.setResizable(true);
+  //frame.setResizable(true);
 
   textSize(textSize);
 
   initButtons();
-  
+
   /**
    * When saving, a copy of the save-file is stored locally which is opened when starting the program
    */
@@ -56,10 +57,14 @@ void draw() {
     textAlign(CORNER);
     buttons[0].display();
     if (i_selectedNode != -1) buttons[1].display();
-    buttons[2].display();
-    buttons[3].display();
-    buttons[4].display();
-    buttons[5].display();
+    if (menuOpen) {
+      buttons[2].display();
+      buttons[3].display();
+      buttons[4].display();
+      buttons[5].display();
+      buttons[6].display();
+    }
+    buttons[7].display();
     rectMode(CENTER);
     textAlign(CENTER);
     textSize(textSize);
@@ -81,3 +86,16 @@ void draw() {
     }
   }
 }
+
+void deleteAll() {
+  for (int i = 0; i < nodeCount; i++) {
+    //nodes[i].deleted = true;
+    i_selectedNode = i;
+    deleteSelectedNode();
+  }
+  nodeCount = 0;
+  for (int i = 0; i < linkCount; i++) {
+    links[i].active = false;
+  }
+  linkCount = 0;
+}
diff --git a/build/application.windows32/source/save_load.pde b/build/application.windows32/source/save_load.pde
index eb7501b..d261652 100644
--- a/build/application.windows32/source/save_load.pde
+++ b/build/application.windows32/source/save_load.pde
@@ -23,17 +23,7 @@ void loadCSVFile(File selection) {
 }
 
 void loadCSV(String path) {
-  for (int i = 0; i < nodeCount; i++) {
-    //nodes[i].deleted = true;
-    i_selectedNode = i;
-    deleteSelectedNode();
-  }
-  nodeCount = 0;
-
-  for (int i = 0; i < linkCount; i++) {
-    links[i].active = false;
-  }
-  linkCount = 0;
+  deleteAll();
 
   String[] loadString = loadStrings(path);
   for (int i = 0; i < loadString.length-1; i++) {
diff --git a/build/application.windows32/source/ui.pde b/build/application.windows32/source/ui.pde
index 67f9b3a..ea86ca1 100644
--- a/build/application.windows32/source/ui.pde
+++ b/build/application.windows32/source/ui.pde
@@ -3,6 +3,7 @@
  * Previous title is remembered in savedTitle and restored when hitting Escape
  */
 String savedTitle;
+
 void keyPressed() {
   if (key == ESC) {
     key = 0;
diff --git a/build/application.windows64/data/save.csv b/build/application.windows64/data/save.csv
index 4ed18e7..139597f 100644
--- a/build/application.windows64/data/save.csv
+++ b/build/application.windows64/data/save.csv
@@ -1,43 +1,2 @@
 
 
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-Biological Process,395,537,32,33
-Physiological Process,292,455,34
-Cellular Process,483,455,34
-Cellular Physiological Process,391,375,36,35
-Cell Cycle,305,296,40,41
-Cell Division,544,265,37
-Cytokinesis,543,165,38
-Cytokinesis after Meiosis,399,54
-M Phase of Meiotic Cell Cycle,310,144,38
-M Phase,239,225,39
-Meiotic Cell Cycle,392,225,39
-
diff --git a/build/application.windows64/lib/ontology.jar b/build/application.windows64/lib/ontology.jar
index 8379e9f..f218851 100644
Binary files a/build/application.windows64/lib/ontology.jar and b/build/application.windows64/lib/ontology.jar differ
diff --git a/build/application.windows64/ontology.exe b/build/application.windows64/ontology.exe
index 3d0c330..c403a9a 100755
Binary files a/build/application.windows64/ontology.exe and b/build/application.windows64/ontology.exe differ
diff --git a/build/application.windows64/source/buttons.pde b/build/application.windows64/source/buttons.pde
deleted file mode 100644
index 525ddb1..0000000
--- a/build/application.windows64/source/buttons.pde
+++ /dev/null
@@ -1,78 +0,0 @@
-int buttonCount = 6;
-int i_buttonId;
-
-void initButtons() {
-  buttons[0] = new Button(10, 10, "Add Node");
-  buttons[1] = new Button(104, 10, "Delete Node");
-  buttons[2] = new Button(10, 50, "Dark/Bright Mode");
-  buttons[3] = new Button(10, 90, "Save");
-  buttons[4] = new Button(10, 130, "Open");
-  buttons[5] = new Button(10, 170, "Export Image");
-/*  buttons[0] = new Button(10, 10, "Node Hinzufügen");
-  buttons[1] = new Button(155, 10, "Löschen");
-  buttons[2] = new Button(10, 50, "Farben umkehren");
-  buttons[3] = new Button(10, 90, "Speichern");
-  buttons[4] = new Button(10, 130, "Öffnen");
-  buttons[5] = new Button(10, 170, "Bild Exportieren");*/
-}
-
-void buttonFunctions(int functionID) {
-  switch (functionID) {
-    case(0):
-    addNode(int(random(50, width-50)), int(random(30, height-150)), "");
-    i_selectedNode = nodeCount-1;
-    break;
-    case(1):
-    deleteSelectedNode();
-    break;
-    case(2):
-    darkMode = !darkMode;
-    break;
-    case(3):
-    saveCSV(dataPath("save.csv"));
-    selectOutput("Where to save .csv file to?", "saveCSVFile");
-    break;
-    case(4):
-    selectInput("Select csv File", "loadCSVFile");
-    break;
-    case(5):
-    selectOutput("Where to export .png image file to?", "savePNGFile");
-    break;
-  default:
-    break;
-  }
-}
-
-
-Button buttons[] = new Button[buttonCount];
-
-class Button {
-  int id, x, y, w, h;
-  String label;
-
-  boolean hover() {
-    return (mouseX > x && mouseX <  x+w && mouseY > y && mouseY < y+h) ? true : false;
-  }
-
-  void click() {
-    buttonFunctions(id);
-  }
-  Button(int x_, int y_, String label_) {
-    id = i_buttonId;
-    i_buttonId++;
-    x = x_;
-    y = y_ ;
-    label = label_;
-    w = int(textWidth(label))+18;
-    h = 32;
-  }
-
-  void display() {
-    stroke(0);
-    strokeWeight(1);
-    fill(255, 127);
-    rect(x, y, w, h, 4);
-    fill(0);
-    text(label, x+9, y+h/2+5);
-  }
-}
diff --git a/build/application.windows64/source/gui.pde b/build/application.windows64/source/gui.pde
new file mode 100644
index 0000000..4b9de3a
--- /dev/null
+++ b/build/application.windows64/source/gui.pde
@@ -0,0 +1,100 @@
+int buttonCount = 8;
+int i_buttonId;
+
+
+
+
+void initButtons() {
+  buttons[0] = new Button(72, 10, "Add Node");
+  buttons[1] = new Button(164, 10, "Delete Node");
+  buttons[2] = new Button(10, 50, "Dark/Bright Mode");
+  buttons[3] = new Button(10, 90, "Save");
+  buttons[4] = new Button(10, 130, "Open");
+  buttons[5] = new Button(10, 170, "Export Image");
+  buttons[6] = new Button(10, 210, "Empty Workspace");
+  buttons[7] = new Button(10, 10, "Menu");
+  /*  buttons[0] = new Button(10, 10, "Node Hinzufügen");
+   buttons[1] = new Button(155, 10, "Löschen");
+   buttons[2] = new Button(10, 50, "Farben umkehren");
+   buttons[3] = new Button(10, 90, "Speichern");
+   buttons[4] = new Button(10, 130, "Öffnen");
+   buttons[5] = new Button(10, 170, "Bild Exportieren");
+   buttons[6] = new Button(10, 210, "Arbeitsfläche leeren");
+   buttons[7] = new Button(10, 210, "Menü");*/
+}
+
+void buttonFunctions(int functionID) {
+  switch (functionID) {
+    case(0):
+    addNode(int(random(50, width-50)), int(random(30, height-150)), "");
+    i_selectedNode = nodeCount-1;
+    break;
+    case(1):
+    deleteSelectedNode();
+    break;
+    case(2):
+    darkMode = !darkMode;
+    break;
+    case(3):
+    saveCSV(dataPath("save.csv"));
+    selectOutput("Where to save .csv file to?", "saveCSVFile");
+    break;
+    case(4):
+    selectInput("Select csv File", "loadCSVFile");
+    break;
+    case(5):
+    selectOutput("Where to export .png image file to?", "savePNGFile");
+    break;
+    case(6):
+    deleteAll();
+    break;
+    case(7):
+    menu();
+    break;
+  default:
+    break;
+  }
+}
+
+
+Button buttons[] = new Button[buttonCount];
+
+class Button {
+  int id, x, y, w, h;
+  String label;
+
+  boolean hover() {
+    return (mouseX > x && mouseX <  x+w && mouseY > y && mouseY < y+h) ? true : false;
+  }
+
+  void click() {
+    buttonFunctions(id);
+  }
+  Button(int x_, int y_, String label_) {
+    id = i_buttonId;
+    i_buttonId++;
+    x = x_;
+    y = y_ ;
+    label = label_;
+    w = int(textWidth(label))+18;
+    h = 32;
+  }
+
+  void display() {
+    stroke(0);
+    strokeWeight(1);
+    fill(255, 127);
+    rect(x, y, w, h, 4);
+    fill(0);
+    text(label, x+9, y+h/2+5);
+  }
+}
+
+boolean menuOpen;
+
+void menu() {
+  if (menuOpen) {
+  } else {
+  }
+  menuOpen = !menuOpen;
+}
diff --git a/build/application.windows64/source/ontology.java b/build/application.windows64/source/ontology.java
index f7bfd3a..cf773f7 100644
--- a/build/application.windows64/source/ontology.java
+++ b/build/application.windows64/source/ontology.java
@@ -23,11 +23,12 @@ boolean darkMode = true;
 public void setup() {
   
   surface.setResizable(true);
+  //frame.setResizable(true);
 
   textSize(textSize);
 
   initButtons();
-  
+
   /**
    * When saving, a copy of the save-file is stored locally which is opened when starting the program
    */
@@ -72,10 +73,14 @@ public void draw() {
     textAlign(CORNER);
     buttons[0].display();
     if (i_selectedNode != -1) buttons[1].display();
-    buttons[2].display();
-    buttons[3].display();
-    buttons[4].display();
-    buttons[5].display();
+    if (menuOpen) {
+      buttons[2].display();
+      buttons[3].display();
+      buttons[4].display();
+      buttons[5].display();
+      buttons[6].display();
+    }
+    buttons[7].display();
     rectMode(CENTER);
     textAlign(CENTER);
     textSize(textSize);
@@ -97,22 +102,42 @@ public void draw() {
     }
   }
 }
-int buttonCount = 6;
+
+public void deleteAll() {
+  for (int i = 0; i < nodeCount; i++) {
+    //nodes[i].deleted = true;
+    i_selectedNode = i;
+    deleteSelectedNode();
+  }
+  nodeCount = 0;
+  for (int i = 0; i < linkCount; i++) {
+    links[i].active = false;
+  }
+  linkCount = 0;
+}
+int buttonCount = 8;
 int i_buttonId;
 
+
+
+
 public void initButtons() {
-  buttons[0] = new Button(10, 10, "Add Node");
-  buttons[1] = new Button(104, 10, "Delete Node");
+  buttons[0] = new Button(72, 10, "Add Node");
+  buttons[1] = new Button(164, 10, "Delete Node");
   buttons[2] = new Button(10, 50, "Dark/Bright Mode");
   buttons[3] = new Button(10, 90, "Save");
   buttons[4] = new Button(10, 130, "Open");
   buttons[5] = new Button(10, 170, "Export Image");
-/*  buttons[0] = new Button(10, 10, "Node Hinzufügen");
-  buttons[1] = new Button(155, 10, "Löschen");
-  buttons[2] = new Button(10, 50, "Farben umkehren");
-  buttons[3] = new Button(10, 90, "Speichern");
-  buttons[4] = new Button(10, 130, "Öffnen");
-  buttons[5] = new Button(10, 170, "Bild Exportieren");*/
+  buttons[6] = new Button(10, 210, "Empty Workspace");
+  buttons[7] = new Button(10, 10, "Menu");
+  /*  buttons[0] = new Button(10, 10, "Node Hinzufügen");
+   buttons[1] = new Button(155, 10, "Löschen");
+   buttons[2] = new Button(10, 50, "Farben umkehren");
+   buttons[3] = new Button(10, 90, "Speichern");
+   buttons[4] = new Button(10, 130, "Öffnen");
+   buttons[5] = new Button(10, 170, "Bild Exportieren");
+   buttons[6] = new Button(10, 210, "Arbeitsfläche leeren");
+   buttons[7] = new Button(10, 210, "Menü");*/
 }
 
 public void buttonFunctions(int functionID) {
@@ -137,6 +162,12 @@ public void buttonFunctions(int functionID) {
     case(5):
     selectOutput("Where to export .png image file to?", "savePNGFile");
     break;
+    case(6):
+    deleteAll();
+    break;
+    case(7):
+    menu();
+    break;
   default:
     break;
   }
@@ -175,6 +206,15 @@ class Button {
     text(label, x+9, y+h/2+5);
   }
 }
+
+boolean menuOpen;
+
+public void menu() {
+  if (menuOpen) {
+  } else {
+  }
+  menuOpen = !menuOpen;
+}
 int linkCount;
 
 boolean dragLink; //state of dragging a link
@@ -364,7 +404,6 @@ class Node {
     text(title, x, y+textSize/3);
   }
 }
-
 /**
  * Saving and loading is a messy hack!
  * You'll get a blank line in your save file for each deleted object.
@@ -390,17 +429,7 @@ public void loadCSVFile(File selection) {
 }
 
 public void loadCSV(String path) {
-  for (int i = 0; i < nodeCount; i++) {
-    //nodes[i].deleted = true;
-    i_selectedNode = i;
-    deleteSelectedNode();
-  }
-  nodeCount = 0;
-
-  for (int i = 0; i < linkCount; i++) {
-    links[i].active = false;
-  }
-  linkCount = 0;
+  deleteAll();
 
   String[] loadString = loadStrings(path);
   for (int i = 0; i < loadString.length-1; i++) {
@@ -439,12 +468,12 @@ public void saveCSV(String path) {
   String[] saveArray = split(saveString, '\n');
   saveStrings(path, saveArray);
 }
-
 /**
  * Keys only get caught for changing a nodes title.
  * Previous title is remembered in savedTitle and restored when hitting Escape
  */
 String savedTitle;
+
 public void keyPressed() {
   if (key == ESC) {
     key = 0;
@@ -564,7 +593,6 @@ public void mouseWheel(MouseEvent event) {
     nodes[i].setVectors();
   }
 }
-
   public void settings() {  size(800, 600); }
   static public void main(String[] passedArgs) {
     String[] appletArgs = new String[] { "ontology" };
diff --git a/build/application.windows64/source/ontology.pde b/build/application.windows64/source/ontology.pde
index 07edee4..41227fc 100644
--- a/build/application.windows64/source/ontology.pde
+++ b/build/application.windows64/source/ontology.pde
@@ -7,11 +7,12 @@ boolean darkMode = true;
 void setup() {
   size(800, 600);
   surface.setResizable(true);
+  //frame.setResizable(true);
 
   textSize(textSize);
 
   initButtons();
-  
+
   /**
    * When saving, a copy of the save-file is stored locally which is opened when starting the program
    */
@@ -56,10 +57,14 @@ void draw() {
     textAlign(CORNER);
     buttons[0].display();
     if (i_selectedNode != -1) buttons[1].display();
-    buttons[2].display();
-    buttons[3].display();
-    buttons[4].display();
-    buttons[5].display();
+    if (menuOpen) {
+      buttons[2].display();
+      buttons[3].display();
+      buttons[4].display();
+      buttons[5].display();
+      buttons[6].display();
+    }
+    buttons[7].display();
     rectMode(CENTER);
     textAlign(CENTER);
     textSize(textSize);
@@ -81,3 +86,16 @@ void draw() {
     }
   }
 }
+
+void deleteAll() {
+  for (int i = 0; i < nodeCount; i++) {
+    //nodes[i].deleted = true;
+    i_selectedNode = i;
+    deleteSelectedNode();
+  }
+  nodeCount = 0;
+  for (int i = 0; i < linkCount; i++) {
+    links[i].active = false;
+  }
+  linkCount = 0;
+}
diff --git a/build/application.windows64/source/save_load.pde b/build/application.windows64/source/save_load.pde
index eb7501b..d261652 100644
--- a/build/application.windows64/source/save_load.pde
+++ b/build/application.windows64/source/save_load.pde
@@ -23,17 +23,7 @@ void loadCSVFile(File selection) {
 }
 
 void loadCSV(String path) {
-  for (int i = 0; i < nodeCount; i++) {
-    //nodes[i].deleted = true;
-    i_selectedNode = i;
-    deleteSelectedNode();
-  }
-  nodeCount = 0;
-
-  for (int i = 0; i < linkCount; i++) {
-    links[i].active = false;
-  }
-  linkCount = 0;
+  deleteAll();
 
   String[] loadString = loadStrings(path);
   for (int i = 0; i < loadString.length-1; i++) {
diff --git a/build/application.windows64/source/ui.pde b/build/application.windows64/source/ui.pde
index 67f9b3a..ea86ca1 100644
--- a/build/application.windows64/source/ui.pde
+++ b/build/application.windows64/source/ui.pde
@@ -3,6 +3,7 @@
  * Previous title is remembered in savedTitle and restored when hitting Escape
  */
 String savedTitle;
+
 void keyPressed() {
   if (key == ESC) {
     key = 0;
diff --git a/data/save.csv b/data/save.csv
index 4ed18e7..139597f 100644
--- a/data/save.csv
+++ b/data/save.csv
@@ -1,43 +1,2 @@
 
 
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-Biological Process,395,537,32,33
-Physiological Process,292,455,34
-Cellular Process,483,455,34
-Cellular Physiological Process,391,375,36,35
-Cell Cycle,305,296,40,41
-Cell Division,544,265,37
-Cytokinesis,543,165,38
-Cytokinesis after Meiosis,399,54
-M Phase of Meiotic Cell Cycle,310,144,38
-M Phase,239,225,39
-Meiotic Cell Cycle,392,225,39
-
diff --git a/gui.pde b/gui.pde
new file mode 100644
index 0000000..4b9de3a
--- /dev/null
+++ b/gui.pde
@@ -0,0 +1,100 @@
+int buttonCount = 8;
+int i_buttonId;
+
+
+
+
+void initButtons() {
+  buttons[0] = new Button(72, 10, "Add Node");
+  buttons[1] = new Button(164, 10, "Delete Node");
+  buttons[2] = new Button(10, 50, "Dark/Bright Mode");
+  buttons[3] = new Button(10, 90, "Save");
+  buttons[4] = new Button(10, 130, "Open");
+  buttons[5] = new Button(10, 170, "Export Image");
+  buttons[6] = new Button(10, 210, "Empty Workspace");
+  buttons[7] = new Button(10, 10, "Menu");
+  /*  buttons[0] = new Button(10, 10, "Node Hinzufügen");
+   buttons[1] = new Button(155, 10, "Löschen");
+   buttons[2] = new Button(10, 50, "Farben umkehren");
+   buttons[3] = new Button(10, 90, "Speichern");
+   buttons[4] = new Button(10, 130, "Öffnen");
+   buttons[5] = new Button(10, 170, "Bild Exportieren");
+   buttons[6] = new Button(10, 210, "Arbeitsfläche leeren");
+   buttons[7] = new Button(10, 210, "Menü");*/
+}
+
+void buttonFunctions(int functionID) {
+  switch (functionID) {
+    case(0):
+    addNode(int(random(50, width-50)), int(random(30, height-150)), "");
+    i_selectedNode = nodeCount-1;
+    break;
+    case(1):
+    deleteSelectedNode();
+    break;
+    case(2):
+    darkMode = !darkMode;
+    break;
+    case(3):
+    saveCSV(dataPath("save.csv"));
+    selectOutput("Where to save .csv file to?", "saveCSVFile");
+    break;
+    case(4):
+    selectInput("Select csv File", "loadCSVFile");
+    break;
+    case(5):
+    selectOutput("Where to export .png image file to?", "savePNGFile");
+    break;
+    case(6):
+    deleteAll();
+    break;
+    case(7):
+    menu();
+    break;
+  default:
+    break;
+  }
+}
+
+
+Button buttons[] = new Button[buttonCount];
+
+class Button {
+  int id, x, y, w, h;
+  String label;
+
+  boolean hover() {
+    return (mouseX > x && mouseX <  x+w && mouseY > y && mouseY < y+h) ? true : false;
+  }
+
+  void click() {
+    buttonFunctions(id);
+  }
+  Button(int x_, int y_, String label_) {
+    id = i_buttonId;
+    i_buttonId++;
+    x = x_;
+    y = y_ ;
+    label = label_;
+    w = int(textWidth(label))+18;
+    h = 32;
+  }
+
+  void display() {
+    stroke(0);
+    strokeWeight(1);
+    fill(255, 127);
+    rect(x, y, w, h, 4);
+    fill(0);
+    text(label, x+9, y+h/2+5);
+  }
+}
+
+boolean menuOpen;
+
+void menu() {
+  if (menuOpen) {
+  } else {
+  }
+  menuOpen = !menuOpen;
+}
diff --git a/ontology.pde b/ontology.pde
index 07edee4..41227fc 100644
--- a/ontology.pde
+++ b/ontology.pde
@@ -7,11 +7,12 @@ boolean darkMode = true;
 void setup() {
   size(800, 600);
   surface.setResizable(true);
+  //frame.setResizable(true);
 
   textSize(textSize);
 
   initButtons();
-  
+
   /**
    * When saving, a copy of the save-file is stored locally which is opened when starting the program
    */
@@ -56,10 +57,14 @@ void draw() {
     textAlign(CORNER);
     buttons[0].display();
     if (i_selectedNode != -1) buttons[1].display();
-    buttons[2].display();
-    buttons[3].display();
-    buttons[4].display();
-    buttons[5].display();
+    if (menuOpen) {
+      buttons[2].display();
+      buttons[3].display();
+      buttons[4].display();
+      buttons[5].display();
+      buttons[6].display();
+    }
+    buttons[7].display();
     rectMode(CENTER);
     textAlign(CENTER);
     textSize(textSize);
@@ -81,3 +86,16 @@ void draw() {
     }
   }
 }
+
+void deleteAll() {
+  for (int i = 0; i < nodeCount; i++) {
+    //nodes[i].deleted = true;
+    i_selectedNode = i;
+    deleteSelectedNode();
+  }
+  nodeCount = 0;
+  for (int i = 0; i < linkCount; i++) {
+    links[i].active = false;
+  }
+  linkCount = 0;
+}
diff --git a/save_load.pde b/save_load.pde
index eb7501b..d261652 100644
--- a/save_load.pde
+++ b/save_load.pde
@@ -23,17 +23,7 @@ void loadCSVFile(File selection) {
 }
 
 void loadCSV(String path) {
-  for (int i = 0; i < nodeCount; i++) {
-    //nodes[i].deleted = true;
-    i_selectedNode = i;
-    deleteSelectedNode();
-  }
-  nodeCount = 0;
-
-  for (int i = 0; i < linkCount; i++) {
-    links[i].active = false;
-  }
-  linkCount = 0;
+  deleteAll();
 
   String[] loadString = loadStrings(path);
   for (int i = 0; i < loadString.length-1; i++) {
diff --git a/ui.pde b/ui.pde
index 67f9b3a..ea86ca1 100644
--- a/ui.pde
+++ b/ui.pde
@@ -3,6 +3,7 @@
  * Previous title is remembered in savedTitle and restored when hitting Escape
  */
 String savedTitle;
+
 void keyPressed() {
   if (key == ESC) {
     key = 0;