diff --git a/lib/gui.py b/lib/gui.py
index cfde27d..68f77dd 100644
--- a/lib/gui.py
+++ b/lib/gui.py
@@ -1166,7 +1166,7 @@ class App():
     def __init__(self, root):
         """Standardgui mit Baum zur Anwahl der Teile des Assemblies"""
 
-        self.root = root
+        self._root = root
         self.build_widgets(root)
 
     def build_widgets(self, root):
@@ -1175,38 +1175,37 @@ class App():
 
         # configure the grid
         # die erste Spalte mit Baum sollte unbeweglich bleiben bei Vergrößerung des Fensters.
-        # self.root.columnconfigure(0, weight=2)
-        self.root.columnconfigure(1, weight=1)
-        #self.root.geometry('800x800')
+        # self._root.columnconfigure(0, weight=2)
+        #self._root.columnconfigure(1, weight=1)
+        #self._root.geometry('800x800')
 
-        style = ttk.Style(self.root)
+        style = ttk.Style(self._root)
         style.theme_use('clam')
 
         # gesamtes Fenster durch Scrollbar, aber auch mit Mausrad verschieben
-        self.root.bind('<MouseWheel>', self.OnMouseWheel)
+        self._root.bind('<MouseWheel>', self.OnMouseWheel)
 
         container = ttk.Frame(root)
-        canvas = tk.Canvas(container, width=800, height=900)
+        self._canvas = tk.Canvas(container, width=800, height=900)
         # canvas = tk.Canvas(container)
-        self.canvas = canvas
 
         # baue eine globale Scrollbar ganz rechts
-        vscrollbar = ttk.Scrollbar(container, orient='vertical', command=canvas.yview)
+        vscrollbar = ttk.Scrollbar(container, orient='vertical', command=self._canvas.yview)
 
         # verknüpfe Scrollbar und Canvas
-        canvas.bind(
+        self._canvas.bind(
             '<Configure>',
-            lambda e: canvas.configure(
-                scrollregion=canvas.bbox("all")
+            lambda e: self._canvas.configure(
+                scrollregion=self._canvas.bbox("all")
             )
         )
-        canvas.configure(yscrollcommand=vscrollbar.set)
+        self._canvas.configure(yscrollcommand=vscrollbar.set)
 
-        inner_frame = ttk.Frame(canvas)
-        canvas.create_window((0, 0), window=inner_frame, anchor="nw")
+        inner_frame = ttk.Frame(self._canvas)
+        self._canvas.create_window((0, 0), window=inner_frame, anchor="nw")
 
         container.pack()
-        canvas.pack(side="left", fill="both", expand=True)
+        self._canvas.pack(side="left", fill="both", expand=True)
         vscrollbar.pack(side="right", fill="y")
 
         # einen linken und rechten Rahmen darin
@@ -1217,6 +1216,8 @@ class App():
         # right_frame = ttk.Frame(inner_frame, width=650,  height=800)
         right_frame = ttk.Frame(inner_frame)
         right_frame.grid(row=0,  column=1,  padx=10,  pady=3)
+        # left_frame.columnconfigure(0, weight=1)
+        # right_frame.columnconfigure(0, weight=6)    
 
 
         self.lf1 = LeftFrameAsm(left_frame, 0)
@@ -1276,10 +1277,10 @@ class App():
         self.rf9.set_controller(controller)
 
     def mainloop(self):
-        self.root.mainloop()
+        self._root.mainloop()
 
     def OnMouseWheel(self,event):
-        self.canvas.yview("scroll", event.delta, "units")
+        self._canvas.yview("scroll", event.delta, "units")
         return "break"
     
     def suche_3d(self):