diff --git a/build/application.linux-arm64/lib/ontology.jar b/build/application.linux-arm64/lib/ontology.jar
index f218851..75ca767 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/gui.pde b/build/application.linux-arm64/source/gui.pde
index 4b9de3a..ed683a3 100644
--- a/build/application.linux-arm64/source/gui.pde
+++ b/build/application.linux-arm64/source/gui.pde
@@ -1,8 +1,14 @@
 int buttonCount = 8;
 int i_buttonId;
+boolean menuOpen = true;
+int[] menuButtons = {2, 3, 4, 5, 6};
 
-
-
+void menu() {
+  menuOpen = !menuOpen;
+  for (int i = 0; i < menuButtons.length; i++) {
+    buttons[menuButtons[i]].active = menuOpen;
+  }
+}
 
 void initButtons() {
   buttons[0] = new Button(72, 10, "Add Node");
@@ -13,6 +19,7 @@ void initButtons() {
   buttons[5] = new Button(10, 170, "Export Image");
   buttons[6] = new Button(10, 210, "Empty Workspace");
   buttons[7] = new Button(10, 10, "Menu");
+  menu();
   /*  buttons[0] = new Button(10, 10, "Node Hinzufügen");
    buttons[1] = new Button(155, 10, "Löschen");
    buttons[2] = new Button(10, 50, "Farben umkehren");
@@ -62,14 +69,16 @@ Button buttons[] = new Button[buttonCount];
 class Button {
   int id, x, y, w, h;
   String label;
+  boolean active;
 
   boolean hover() {
-    return (mouseX > x && mouseX <  x+w && mouseY > y && mouseY < y+h) ? true : false;
+    return (active) ? ((mouseX > x && mouseX <  x+w && mouseY > y && mouseY < y+h) ? true : false) : false;
   }
 
   void click() {
     buttonFunctions(id);
   }
+
   Button(int x_, int y_, String label_) {
     id = i_buttonId;
     i_buttonId++;
@@ -78,23 +87,17 @@ class Button {
     label = label_;
     w = int(textWidth(label))+18;
     h = 32;
+    active = true;
   }
 
   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);
+    if (active) {
+      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.linux-arm64/source/ontology.java b/build/application.linux-arm64/source/ontology.java
index cf773f7..5d55eed 100644
--- a/build/application.linux-arm64/source/ontology.java
+++ b/build/application.linux-arm64/source/ontology.java
@@ -73,13 +73,11 @@ public void draw() {
     textAlign(CORNER);
     buttons[0].display();
     if (i_selectedNode != -1) buttons[1].display();
-    if (menuOpen) {
-      buttons[2].display();
-      buttons[3].display();
-      buttons[4].display();
-      buttons[5].display();
-      buttons[6].display();
-    }
+    buttons[2].display();
+    buttons[3].display();
+    buttons[4].display();
+    buttons[5].display();
+    buttons[6].display();
     buttons[7].display();
     rectMode(CENTER);
     textAlign(CENTER);
@@ -117,9 +115,15 @@ public void deleteAll() {
 }
 int buttonCount = 8;
 int i_buttonId;
+boolean menuOpen = true;
+int[] menuButtons = {2, 3, 4, 5, 6};
 
-
-
+public void menu() {
+  menuOpen = !menuOpen;
+  for (int i = 0; i < menuButtons.length; i++) {
+    buttons[menuButtons[i]].active = menuOpen;
+  }
+}
 
 public void initButtons() {
   buttons[0] = new Button(72, 10, "Add Node");
@@ -130,6 +134,7 @@ public void initButtons() {
   buttons[5] = new Button(10, 170, "Export Image");
   buttons[6] = new Button(10, 210, "Empty Workspace");
   buttons[7] = new Button(10, 10, "Menu");
+  menu();
   /*  buttons[0] = new Button(10, 10, "Node Hinzufügen");
    buttons[1] = new Button(155, 10, "Löschen");
    buttons[2] = new Button(10, 50, "Farben umkehren");
@@ -179,14 +184,16 @@ Button buttons[] = new Button[buttonCount];
 class Button {
   int id, x, y, w, h;
   String label;
+  boolean active;
 
   public boolean hover() {
-    return (mouseX > x && mouseX <  x+w && mouseY > y && mouseY < y+h) ? true : false;
+    return (active) ? ((mouseX > x && mouseX <  x+w && mouseY > y && mouseY < y+h) ? true : false) : false;
   }
 
   public void click() {
     buttonFunctions(id);
   }
+
   Button(int x_, int y_, String label_) {
     id = i_buttonId;
     i_buttonId++;
@@ -195,26 +202,20 @@ class Button {
     label = label_;
     w = PApplet.parseInt(textWidth(label))+18;
     h = 32;
+    active = true;
   }
 
   public 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);
+    if (active) {
+      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;
-
-public void menu() {
-  if (menuOpen) {
-  } else {
-  }
-  menuOpen = !menuOpen;
-}
 int linkCount;
 
 boolean dragLink; //state of dragging a link
diff --git a/build/application.linux-arm64/source/ontology.pde b/build/application.linux-arm64/source/ontology.pde
index 41227fc..f9f76d1 100644
--- a/build/application.linux-arm64/source/ontology.pde
+++ b/build/application.linux-arm64/source/ontology.pde
@@ -57,13 +57,11 @@ void draw() {
     textAlign(CORNER);
     buttons[0].display();
     if (i_selectedNode != -1) buttons[1].display();
-    if (menuOpen) {
-      buttons[2].display();
-      buttons[3].display();
-      buttons[4].display();
-      buttons[5].display();
-      buttons[6].display();
-    }
+    buttons[2].display();
+    buttons[3].display();
+    buttons[4].display();
+    buttons[5].display();
+    buttons[6].display();
     buttons[7].display();
     rectMode(CENTER);
     textAlign(CENTER);
diff --git a/build/application.linux-armv6hf/lib/ontology.jar b/build/application.linux-armv6hf/lib/ontology.jar
index f218851..75ca767 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/gui.pde b/build/application.linux-armv6hf/source/gui.pde
index 4b9de3a..ed683a3 100644
--- a/build/application.linux-armv6hf/source/gui.pde
+++ b/build/application.linux-armv6hf/source/gui.pde
@@ -1,8 +1,14 @@
 int buttonCount = 8;
 int i_buttonId;
+boolean menuOpen = true;
+int[] menuButtons = {2, 3, 4, 5, 6};
 
-
-
+void menu() {
+  menuOpen = !menuOpen;
+  for (int i = 0; i < menuButtons.length; i++) {
+    buttons[menuButtons[i]].active = menuOpen;
+  }
+}
 
 void initButtons() {
   buttons[0] = new Button(72, 10, "Add Node");
@@ -13,6 +19,7 @@ void initButtons() {
   buttons[5] = new Button(10, 170, "Export Image");
   buttons[6] = new Button(10, 210, "Empty Workspace");
   buttons[7] = new Button(10, 10, "Menu");
+  menu();
   /*  buttons[0] = new Button(10, 10, "Node Hinzufügen");
    buttons[1] = new Button(155, 10, "Löschen");
    buttons[2] = new Button(10, 50, "Farben umkehren");
@@ -62,14 +69,16 @@ Button buttons[] = new Button[buttonCount];
 class Button {
   int id, x, y, w, h;
   String label;
+  boolean active;
 
   boolean hover() {
-    return (mouseX > x && mouseX <  x+w && mouseY > y && mouseY < y+h) ? true : false;
+    return (active) ? ((mouseX > x && mouseX <  x+w && mouseY > y && mouseY < y+h) ? true : false) : false;
   }
 
   void click() {
     buttonFunctions(id);
   }
+
   Button(int x_, int y_, String label_) {
     id = i_buttonId;
     i_buttonId++;
@@ -78,23 +87,17 @@ class Button {
     label = label_;
     w = int(textWidth(label))+18;
     h = 32;
+    active = true;
   }
 
   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);
+    if (active) {
+      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.linux-armv6hf/source/ontology.java b/build/application.linux-armv6hf/source/ontology.java
index cf773f7..5d55eed 100644
--- a/build/application.linux-armv6hf/source/ontology.java
+++ b/build/application.linux-armv6hf/source/ontology.java
@@ -73,13 +73,11 @@ public void draw() {
     textAlign(CORNER);
     buttons[0].display();
     if (i_selectedNode != -1) buttons[1].display();
-    if (menuOpen) {
-      buttons[2].display();
-      buttons[3].display();
-      buttons[4].display();
-      buttons[5].display();
-      buttons[6].display();
-    }
+    buttons[2].display();
+    buttons[3].display();
+    buttons[4].display();
+    buttons[5].display();
+    buttons[6].display();
     buttons[7].display();
     rectMode(CENTER);
     textAlign(CENTER);
@@ -117,9 +115,15 @@ public void deleteAll() {
 }
 int buttonCount = 8;
 int i_buttonId;
+boolean menuOpen = true;
+int[] menuButtons = {2, 3, 4, 5, 6};
 
-
-
+public void menu() {
+  menuOpen = !menuOpen;
+  for (int i = 0; i < menuButtons.length; i++) {
+    buttons[menuButtons[i]].active = menuOpen;
+  }
+}
 
 public void initButtons() {
   buttons[0] = new Button(72, 10, "Add Node");
@@ -130,6 +134,7 @@ public void initButtons() {
   buttons[5] = new Button(10, 170, "Export Image");
   buttons[6] = new Button(10, 210, "Empty Workspace");
   buttons[7] = new Button(10, 10, "Menu");
+  menu();
   /*  buttons[0] = new Button(10, 10, "Node Hinzufügen");
    buttons[1] = new Button(155, 10, "Löschen");
    buttons[2] = new Button(10, 50, "Farben umkehren");
@@ -179,14 +184,16 @@ Button buttons[] = new Button[buttonCount];
 class Button {
   int id, x, y, w, h;
   String label;
+  boolean active;
 
   public boolean hover() {
-    return (mouseX > x && mouseX <  x+w && mouseY > y && mouseY < y+h) ? true : false;
+    return (active) ? ((mouseX > x && mouseX <  x+w && mouseY > y && mouseY < y+h) ? true : false) : false;
   }
 
   public void click() {
     buttonFunctions(id);
   }
+
   Button(int x_, int y_, String label_) {
     id = i_buttonId;
     i_buttonId++;
@@ -195,26 +202,20 @@ class Button {
     label = label_;
     w = PApplet.parseInt(textWidth(label))+18;
     h = 32;
+    active = true;
   }
 
   public 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);
+    if (active) {
+      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;
-
-public void menu() {
-  if (menuOpen) {
-  } else {
-  }
-  menuOpen = !menuOpen;
-}
 int linkCount;
 
 boolean dragLink; //state of dragging a link
diff --git a/build/application.linux-armv6hf/source/ontology.pde b/build/application.linux-armv6hf/source/ontology.pde
index 41227fc..f9f76d1 100644
--- a/build/application.linux-armv6hf/source/ontology.pde
+++ b/build/application.linux-armv6hf/source/ontology.pde
@@ -57,13 +57,11 @@ void draw() {
     textAlign(CORNER);
     buttons[0].display();
     if (i_selectedNode != -1) buttons[1].display();
-    if (menuOpen) {
-      buttons[2].display();
-      buttons[3].display();
-      buttons[4].display();
-      buttons[5].display();
-      buttons[6].display();
-    }
+    buttons[2].display();
+    buttons[3].display();
+    buttons[4].display();
+    buttons[5].display();
+    buttons[6].display();
     buttons[7].display();
     rectMode(CENTER);
     textAlign(CENTER);
diff --git a/build/application.linux32/lib/ontology.jar b/build/application.linux32/lib/ontology.jar
index f218851..75ca767 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/gui.pde b/build/application.linux32/source/gui.pde
index 4b9de3a..ed683a3 100644
--- a/build/application.linux32/source/gui.pde
+++ b/build/application.linux32/source/gui.pde
@@ -1,8 +1,14 @@
 int buttonCount = 8;
 int i_buttonId;
+boolean menuOpen = true;
+int[] menuButtons = {2, 3, 4, 5, 6};
 
-
-
+void menu() {
+  menuOpen = !menuOpen;
+  for (int i = 0; i < menuButtons.length; i++) {
+    buttons[menuButtons[i]].active = menuOpen;
+  }
+}
 
 void initButtons() {
   buttons[0] = new Button(72, 10, "Add Node");
@@ -13,6 +19,7 @@ void initButtons() {
   buttons[5] = new Button(10, 170, "Export Image");
   buttons[6] = new Button(10, 210, "Empty Workspace");
   buttons[7] = new Button(10, 10, "Menu");
+  menu();
   /*  buttons[0] = new Button(10, 10, "Node Hinzufügen");
    buttons[1] = new Button(155, 10, "Löschen");
    buttons[2] = new Button(10, 50, "Farben umkehren");
@@ -62,14 +69,16 @@ Button buttons[] = new Button[buttonCount];
 class Button {
   int id, x, y, w, h;
   String label;
+  boolean active;
 
   boolean hover() {
-    return (mouseX > x && mouseX <  x+w && mouseY > y && mouseY < y+h) ? true : false;
+    return (active) ? ((mouseX > x && mouseX <  x+w && mouseY > y && mouseY < y+h) ? true : false) : false;
   }
 
   void click() {
     buttonFunctions(id);
   }
+
   Button(int x_, int y_, String label_) {
     id = i_buttonId;
     i_buttonId++;
@@ -78,23 +87,17 @@ class Button {
     label = label_;
     w = int(textWidth(label))+18;
     h = 32;
+    active = true;
   }
 
   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);
+    if (active) {
+      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.linux32/source/ontology.java b/build/application.linux32/source/ontology.java
index cf773f7..5d55eed 100644
--- a/build/application.linux32/source/ontology.java
+++ b/build/application.linux32/source/ontology.java
@@ -73,13 +73,11 @@ public void draw() {
     textAlign(CORNER);
     buttons[0].display();
     if (i_selectedNode != -1) buttons[1].display();
-    if (menuOpen) {
-      buttons[2].display();
-      buttons[3].display();
-      buttons[4].display();
-      buttons[5].display();
-      buttons[6].display();
-    }
+    buttons[2].display();
+    buttons[3].display();
+    buttons[4].display();
+    buttons[5].display();
+    buttons[6].display();
     buttons[7].display();
     rectMode(CENTER);
     textAlign(CENTER);
@@ -117,9 +115,15 @@ public void deleteAll() {
 }
 int buttonCount = 8;
 int i_buttonId;
+boolean menuOpen = true;
+int[] menuButtons = {2, 3, 4, 5, 6};
 
-
-
+public void menu() {
+  menuOpen = !menuOpen;
+  for (int i = 0; i < menuButtons.length; i++) {
+    buttons[menuButtons[i]].active = menuOpen;
+  }
+}
 
 public void initButtons() {
   buttons[0] = new Button(72, 10, "Add Node");
@@ -130,6 +134,7 @@ public void initButtons() {
   buttons[5] = new Button(10, 170, "Export Image");
   buttons[6] = new Button(10, 210, "Empty Workspace");
   buttons[7] = new Button(10, 10, "Menu");
+  menu();
   /*  buttons[0] = new Button(10, 10, "Node Hinzufügen");
    buttons[1] = new Button(155, 10, "Löschen");
    buttons[2] = new Button(10, 50, "Farben umkehren");
@@ -179,14 +184,16 @@ Button buttons[] = new Button[buttonCount];
 class Button {
   int id, x, y, w, h;
   String label;
+  boolean active;
 
   public boolean hover() {
-    return (mouseX > x && mouseX <  x+w && mouseY > y && mouseY < y+h) ? true : false;
+    return (active) ? ((mouseX > x && mouseX <  x+w && mouseY > y && mouseY < y+h) ? true : false) : false;
   }
 
   public void click() {
     buttonFunctions(id);
   }
+
   Button(int x_, int y_, String label_) {
     id = i_buttonId;
     i_buttonId++;
@@ -195,26 +202,20 @@ class Button {
     label = label_;
     w = PApplet.parseInt(textWidth(label))+18;
     h = 32;
+    active = true;
   }
 
   public 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);
+    if (active) {
+      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;
-
-public void menu() {
-  if (menuOpen) {
-  } else {
-  }
-  menuOpen = !menuOpen;
-}
 int linkCount;
 
 boolean dragLink; //state of dragging a link
diff --git a/build/application.linux32/source/ontology.pde b/build/application.linux32/source/ontology.pde
index 41227fc..f9f76d1 100644
--- a/build/application.linux32/source/ontology.pde
+++ b/build/application.linux32/source/ontology.pde
@@ -57,13 +57,11 @@ void draw() {
     textAlign(CORNER);
     buttons[0].display();
     if (i_selectedNode != -1) buttons[1].display();
-    if (menuOpen) {
-      buttons[2].display();
-      buttons[3].display();
-      buttons[4].display();
-      buttons[5].display();
-      buttons[6].display();
-    }
+    buttons[2].display();
+    buttons[3].display();
+    buttons[4].display();
+    buttons[5].display();
+    buttons[6].display();
     buttons[7].display();
     rectMode(CENTER);
     textAlign(CENTER);
diff --git a/build/application.linux64/lib/ontology.jar b/build/application.linux64/lib/ontology.jar
index f218851..75ca767 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/gui.pde b/build/application.linux64/source/gui.pde
index 4b9de3a..ed683a3 100644
--- a/build/application.linux64/source/gui.pde
+++ b/build/application.linux64/source/gui.pde
@@ -1,8 +1,14 @@
 int buttonCount = 8;
 int i_buttonId;
+boolean menuOpen = true;
+int[] menuButtons = {2, 3, 4, 5, 6};
 
-
-
+void menu() {
+  menuOpen = !menuOpen;
+  for (int i = 0; i < menuButtons.length; i++) {
+    buttons[menuButtons[i]].active = menuOpen;
+  }
+}
 
 void initButtons() {
   buttons[0] = new Button(72, 10, "Add Node");
@@ -13,6 +19,7 @@ void initButtons() {
   buttons[5] = new Button(10, 170, "Export Image");
   buttons[6] = new Button(10, 210, "Empty Workspace");
   buttons[7] = new Button(10, 10, "Menu");
+  menu();
   /*  buttons[0] = new Button(10, 10, "Node Hinzufügen");
    buttons[1] = new Button(155, 10, "Löschen");
    buttons[2] = new Button(10, 50, "Farben umkehren");
@@ -62,14 +69,16 @@ Button buttons[] = new Button[buttonCount];
 class Button {
   int id, x, y, w, h;
   String label;
+  boolean active;
 
   boolean hover() {
-    return (mouseX > x && mouseX <  x+w && mouseY > y && mouseY < y+h) ? true : false;
+    return (active) ? ((mouseX > x && mouseX <  x+w && mouseY > y && mouseY < y+h) ? true : false) : false;
   }
 
   void click() {
     buttonFunctions(id);
   }
+
   Button(int x_, int y_, String label_) {
     id = i_buttonId;
     i_buttonId++;
@@ -78,23 +87,17 @@ class Button {
     label = label_;
     w = int(textWidth(label))+18;
     h = 32;
+    active = true;
   }
 
   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);
+    if (active) {
+      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.linux64/source/ontology.java b/build/application.linux64/source/ontology.java
index cf773f7..5d55eed 100644
--- a/build/application.linux64/source/ontology.java
+++ b/build/application.linux64/source/ontology.java
@@ -73,13 +73,11 @@ public void draw() {
     textAlign(CORNER);
     buttons[0].display();
     if (i_selectedNode != -1) buttons[1].display();
-    if (menuOpen) {
-      buttons[2].display();
-      buttons[3].display();
-      buttons[4].display();
-      buttons[5].display();
-      buttons[6].display();
-    }
+    buttons[2].display();
+    buttons[3].display();
+    buttons[4].display();
+    buttons[5].display();
+    buttons[6].display();
     buttons[7].display();
     rectMode(CENTER);
     textAlign(CENTER);
@@ -117,9 +115,15 @@ public void deleteAll() {
 }
 int buttonCount = 8;
 int i_buttonId;
+boolean menuOpen = true;
+int[] menuButtons = {2, 3, 4, 5, 6};
 
-
-
+public void menu() {
+  menuOpen = !menuOpen;
+  for (int i = 0; i < menuButtons.length; i++) {
+    buttons[menuButtons[i]].active = menuOpen;
+  }
+}
 
 public void initButtons() {
   buttons[0] = new Button(72, 10, "Add Node");
@@ -130,6 +134,7 @@ public void initButtons() {
   buttons[5] = new Button(10, 170, "Export Image");
   buttons[6] = new Button(10, 210, "Empty Workspace");
   buttons[7] = new Button(10, 10, "Menu");
+  menu();
   /*  buttons[0] = new Button(10, 10, "Node Hinzufügen");
    buttons[1] = new Button(155, 10, "Löschen");
    buttons[2] = new Button(10, 50, "Farben umkehren");
@@ -179,14 +184,16 @@ Button buttons[] = new Button[buttonCount];
 class Button {
   int id, x, y, w, h;
   String label;
+  boolean active;
 
   public boolean hover() {
-    return (mouseX > x && mouseX <  x+w && mouseY > y && mouseY < y+h) ? true : false;
+    return (active) ? ((mouseX > x && mouseX <  x+w && mouseY > y && mouseY < y+h) ? true : false) : false;
   }
 
   public void click() {
     buttonFunctions(id);
   }
+
   Button(int x_, int y_, String label_) {
     id = i_buttonId;
     i_buttonId++;
@@ -195,26 +202,20 @@ class Button {
     label = label_;
     w = PApplet.parseInt(textWidth(label))+18;
     h = 32;
+    active = true;
   }
 
   public 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);
+    if (active) {
+      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;
-
-public void menu() {
-  if (menuOpen) {
-  } else {
-  }
-  menuOpen = !menuOpen;
-}
 int linkCount;
 
 boolean dragLink; //state of dragging a link
diff --git a/build/application.linux64/source/ontology.pde b/build/application.linux64/source/ontology.pde
index 41227fc..f9f76d1 100644
--- a/build/application.linux64/source/ontology.pde
+++ b/build/application.linux64/source/ontology.pde
@@ -57,13 +57,11 @@ void draw() {
     textAlign(CORNER);
     buttons[0].display();
     if (i_selectedNode != -1) buttons[1].display();
-    if (menuOpen) {
-      buttons[2].display();
-      buttons[3].display();
-      buttons[4].display();
-      buttons[5].display();
-      buttons[6].display();
-    }
+    buttons[2].display();
+    buttons[3].display();
+    buttons[4].display();
+    buttons[5].display();
+    buttons[6].display();
     buttons[7].display();
     rectMode(CENTER);
     textAlign(CENTER);
diff --git a/build/application.windows32/lib/ontology.jar b/build/application.windows32/lib/ontology.jar
index f218851..3a44ce1 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 46d29a1..9ac3782 100755
Binary files a/build/application.windows32/ontology.exe and b/build/application.windows32/ontology.exe differ
diff --git a/build/application.windows32/source/gui.pde b/build/application.windows32/source/gui.pde
index 4b9de3a..ed683a3 100644
--- a/build/application.windows32/source/gui.pde
+++ b/build/application.windows32/source/gui.pde
@@ -1,8 +1,14 @@
 int buttonCount = 8;
 int i_buttonId;
+boolean menuOpen = true;
+int[] menuButtons = {2, 3, 4, 5, 6};
 
-
-
+void menu() {
+  menuOpen = !menuOpen;
+  for (int i = 0; i < menuButtons.length; i++) {
+    buttons[menuButtons[i]].active = menuOpen;
+  }
+}
 
 void initButtons() {
   buttons[0] = new Button(72, 10, "Add Node");
@@ -13,6 +19,7 @@ void initButtons() {
   buttons[5] = new Button(10, 170, "Export Image");
   buttons[6] = new Button(10, 210, "Empty Workspace");
   buttons[7] = new Button(10, 10, "Menu");
+  menu();
   /*  buttons[0] = new Button(10, 10, "Node Hinzufügen");
    buttons[1] = new Button(155, 10, "Löschen");
    buttons[2] = new Button(10, 50, "Farben umkehren");
@@ -62,14 +69,16 @@ Button buttons[] = new Button[buttonCount];
 class Button {
   int id, x, y, w, h;
   String label;
+  boolean active;
 
   boolean hover() {
-    return (mouseX > x && mouseX <  x+w && mouseY > y && mouseY < y+h) ? true : false;
+    return (active) ? ((mouseX > x && mouseX <  x+w && mouseY > y && mouseY < y+h) ? true : false) : false;
   }
 
   void click() {
     buttonFunctions(id);
   }
+
   Button(int x_, int y_, String label_) {
     id = i_buttonId;
     i_buttonId++;
@@ -78,23 +87,17 @@ class Button {
     label = label_;
     w = int(textWidth(label))+18;
     h = 32;
+    active = true;
   }
 
   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);
+    if (active) {
+      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 cf773f7..5d55eed 100644
--- a/build/application.windows32/source/ontology.java
+++ b/build/application.windows32/source/ontology.java
@@ -73,13 +73,11 @@ public void draw() {
     textAlign(CORNER);
     buttons[0].display();
     if (i_selectedNode != -1) buttons[1].display();
-    if (menuOpen) {
-      buttons[2].display();
-      buttons[3].display();
-      buttons[4].display();
-      buttons[5].display();
-      buttons[6].display();
-    }
+    buttons[2].display();
+    buttons[3].display();
+    buttons[4].display();
+    buttons[5].display();
+    buttons[6].display();
     buttons[7].display();
     rectMode(CENTER);
     textAlign(CENTER);
@@ -117,9 +115,15 @@ public void deleteAll() {
 }
 int buttonCount = 8;
 int i_buttonId;
+boolean menuOpen = true;
+int[] menuButtons = {2, 3, 4, 5, 6};
 
-
-
+public void menu() {
+  menuOpen = !menuOpen;
+  for (int i = 0; i < menuButtons.length; i++) {
+    buttons[menuButtons[i]].active = menuOpen;
+  }
+}
 
 public void initButtons() {
   buttons[0] = new Button(72, 10, "Add Node");
@@ -130,6 +134,7 @@ public void initButtons() {
   buttons[5] = new Button(10, 170, "Export Image");
   buttons[6] = new Button(10, 210, "Empty Workspace");
   buttons[7] = new Button(10, 10, "Menu");
+  menu();
   /*  buttons[0] = new Button(10, 10, "Node Hinzufügen");
    buttons[1] = new Button(155, 10, "Löschen");
    buttons[2] = new Button(10, 50, "Farben umkehren");
@@ -179,14 +184,16 @@ Button buttons[] = new Button[buttonCount];
 class Button {
   int id, x, y, w, h;
   String label;
+  boolean active;
 
   public boolean hover() {
-    return (mouseX > x && mouseX <  x+w && mouseY > y && mouseY < y+h) ? true : false;
+    return (active) ? ((mouseX > x && mouseX <  x+w && mouseY > y && mouseY < y+h) ? true : false) : false;
   }
 
   public void click() {
     buttonFunctions(id);
   }
+
   Button(int x_, int y_, String label_) {
     id = i_buttonId;
     i_buttonId++;
@@ -195,26 +202,20 @@ class Button {
     label = label_;
     w = PApplet.parseInt(textWidth(label))+18;
     h = 32;
+    active = true;
   }
 
   public 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);
+    if (active) {
+      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;
-
-public void menu() {
-  if (menuOpen) {
-  } else {
-  }
-  menuOpen = !menuOpen;
-}
 int linkCount;
 
 boolean dragLink; //state of dragging a link
diff --git a/build/application.windows32/source/ontology.pde b/build/application.windows32/source/ontology.pde
index 41227fc..f9f76d1 100644
--- a/build/application.windows32/source/ontology.pde
+++ b/build/application.windows32/source/ontology.pde
@@ -57,13 +57,11 @@ void draw() {
     textAlign(CORNER);
     buttons[0].display();
     if (i_selectedNode != -1) buttons[1].display();
-    if (menuOpen) {
-      buttons[2].display();
-      buttons[3].display();
-      buttons[4].display();
-      buttons[5].display();
-      buttons[6].display();
-    }
+    buttons[2].display();
+    buttons[3].display();
+    buttons[4].display();
+    buttons[5].display();
+    buttons[6].display();
     buttons[7].display();
     rectMode(CENTER);
     textAlign(CENTER);
diff --git a/build/application.windows64/lib/ontology.jar b/build/application.windows64/lib/ontology.jar
index f218851..75ca767 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 c403a9a..90fec59 100755
Binary files a/build/application.windows64/ontology.exe and b/build/application.windows64/ontology.exe differ
diff --git a/build/application.windows64/source/gui.pde b/build/application.windows64/source/gui.pde
index 4b9de3a..ed683a3 100644
--- a/build/application.windows64/source/gui.pde
+++ b/build/application.windows64/source/gui.pde
@@ -1,8 +1,14 @@
 int buttonCount = 8;
 int i_buttonId;
+boolean menuOpen = true;
+int[] menuButtons = {2, 3, 4, 5, 6};
 
-
-
+void menu() {
+  menuOpen = !menuOpen;
+  for (int i = 0; i < menuButtons.length; i++) {
+    buttons[menuButtons[i]].active = menuOpen;
+  }
+}
 
 void initButtons() {
   buttons[0] = new Button(72, 10, "Add Node");
@@ -13,6 +19,7 @@ void initButtons() {
   buttons[5] = new Button(10, 170, "Export Image");
   buttons[6] = new Button(10, 210, "Empty Workspace");
   buttons[7] = new Button(10, 10, "Menu");
+  menu();
   /*  buttons[0] = new Button(10, 10, "Node Hinzufügen");
    buttons[1] = new Button(155, 10, "Löschen");
    buttons[2] = new Button(10, 50, "Farben umkehren");
@@ -62,14 +69,16 @@ Button buttons[] = new Button[buttonCount];
 class Button {
   int id, x, y, w, h;
   String label;
+  boolean active;
 
   boolean hover() {
-    return (mouseX > x && mouseX <  x+w && mouseY > y && mouseY < y+h) ? true : false;
+    return (active) ? ((mouseX > x && mouseX <  x+w && mouseY > y && mouseY < y+h) ? true : false) : false;
   }
 
   void click() {
     buttonFunctions(id);
   }
+
   Button(int x_, int y_, String label_) {
     id = i_buttonId;
     i_buttonId++;
@@ -78,23 +87,17 @@ class Button {
     label = label_;
     w = int(textWidth(label))+18;
     h = 32;
+    active = true;
   }
 
   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);
+    if (active) {
+      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 cf773f7..5d55eed 100644
--- a/build/application.windows64/source/ontology.java
+++ b/build/application.windows64/source/ontology.java
@@ -73,13 +73,11 @@ public void draw() {
     textAlign(CORNER);
     buttons[0].display();
     if (i_selectedNode != -1) buttons[1].display();
-    if (menuOpen) {
-      buttons[2].display();
-      buttons[3].display();
-      buttons[4].display();
-      buttons[5].display();
-      buttons[6].display();
-    }
+    buttons[2].display();
+    buttons[3].display();
+    buttons[4].display();
+    buttons[5].display();
+    buttons[6].display();
     buttons[7].display();
     rectMode(CENTER);
     textAlign(CENTER);
@@ -117,9 +115,15 @@ public void deleteAll() {
 }
 int buttonCount = 8;
 int i_buttonId;
+boolean menuOpen = true;
+int[] menuButtons = {2, 3, 4, 5, 6};
 
-
-
+public void menu() {
+  menuOpen = !menuOpen;
+  for (int i = 0; i < menuButtons.length; i++) {
+    buttons[menuButtons[i]].active = menuOpen;
+  }
+}
 
 public void initButtons() {
   buttons[0] = new Button(72, 10, "Add Node");
@@ -130,6 +134,7 @@ public void initButtons() {
   buttons[5] = new Button(10, 170, "Export Image");
   buttons[6] = new Button(10, 210, "Empty Workspace");
   buttons[7] = new Button(10, 10, "Menu");
+  menu();
   /*  buttons[0] = new Button(10, 10, "Node Hinzufügen");
    buttons[1] = new Button(155, 10, "Löschen");
    buttons[2] = new Button(10, 50, "Farben umkehren");
@@ -179,14 +184,16 @@ Button buttons[] = new Button[buttonCount];
 class Button {
   int id, x, y, w, h;
   String label;
+  boolean active;
 
   public boolean hover() {
-    return (mouseX > x && mouseX <  x+w && mouseY > y && mouseY < y+h) ? true : false;
+    return (active) ? ((mouseX > x && mouseX <  x+w && mouseY > y && mouseY < y+h) ? true : false) : false;
   }
 
   public void click() {
     buttonFunctions(id);
   }
+
   Button(int x_, int y_, String label_) {
     id = i_buttonId;
     i_buttonId++;
@@ -195,26 +202,20 @@ class Button {
     label = label_;
     w = PApplet.parseInt(textWidth(label))+18;
     h = 32;
+    active = true;
   }
 
   public 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);
+    if (active) {
+      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;
-
-public void menu() {
-  if (menuOpen) {
-  } else {
-  }
-  menuOpen = !menuOpen;
-}
 int linkCount;
 
 boolean dragLink; //state of dragging a link
diff --git a/build/application.windows64/source/ontology.pde b/build/application.windows64/source/ontology.pde
index 41227fc..f9f76d1 100644
--- a/build/application.windows64/source/ontology.pde
+++ b/build/application.windows64/source/ontology.pde
@@ -57,13 +57,11 @@ void draw() {
     textAlign(CORNER);
     buttons[0].display();
     if (i_selectedNode != -1) buttons[1].display();
-    if (menuOpen) {
-      buttons[2].display();
-      buttons[3].display();
-      buttons[4].display();
-      buttons[5].display();
-      buttons[6].display();
-    }
+    buttons[2].display();
+    buttons[3].display();
+    buttons[4].display();
+    buttons[5].display();
+    buttons[6].display();
     buttons[7].display();
     rectMode(CENTER);
     textAlign(CENTER);