diff --git a/lib/CreoMigrateGui.py b/lib/CreoMigrateGui.py
index 274dcd7..1b874a9 100644
--- a/lib/CreoMigrateGui.py
+++ b/lib/CreoMigrateGui.py
@@ -178,6 +178,7 @@ class RightFramePDM(AllRightFrames):
                 variable=self.neuaufbau,
                 onvalue="True",
                 offvalue="False")
+                #command=self.checkbox_callback,
         neuaufbau_checkbutton.grid(column=col_left+2, row=self.rownum, sticky=tk.W, padx=5, pady=5)
         self.rownum += 1
 
@@ -201,6 +202,7 @@ class RightFramePDM(AllRightFrames):
                 variable=self.aus_halbzeug_neu,
                 onvalue="True",
                 offvalue="False")
+                #command=self.checkbox_callback,
         aushalbzeug_checkbuttonr.grid(column=col_left+2, row=self.rownum, sticky=tk.W, padx=5, pady=5)
         self.rownum += 1
 
@@ -237,6 +239,12 @@ class RightFramePDM(AllRightFrames):
     def combo_callbacks(self, event):
         """ handle the changed event of TK"""
         # TODO falls nötig 
+        a = 6
+        pass
+
+    def checkbox_callback(self, event):
+        """ handle the changed event of TK"""
+        a = 6
         pass
 
 
diff --git a/lib/caditem.py b/lib/caditem.py
index 3e517e2..7fba644 100644
--- a/lib/caditem.py
+++ b/lib/caditem.py
@@ -1,5 +1,5 @@
 import json
-from  controller import Controller, Event
+from  controller import Controller
 
 
 
diff --git a/lib/controller.py b/lib/controller.py
index 82d61fb..9e052e7 100644
--- a/lib/controller.py
+++ b/lib/controller.py
@@ -2,30 +2,7 @@
 Contains the logic for the MVC of CreoMigrate Gui
 """
 
-class Observer():
-    _observers = []
-    def __init__(self):
-        self._observers.append(self)
-        self._observables = {}
-
-    def observe(self, event_name, callback):
-        """If the observer is not in the list,
-        append it into the list"""
-        if event_name not in self._observables:
-            self._observables[event_name] = callback
-
-class Event():
-    def __init__(self, name, data, autofire = True):
-        self.name = name
-        self.data = data
-        if autofire:
-            self.fire()
-    def fire(self):
-        for observer in Observer._observers:
-            if self.name in observer._observables:
-                observer._observables[self.name](self.data)
-
-class Controller(Observer):
+class Controller():
     """
     Class for manipulating the model and returning data for the view
     """