Tkinter rename, step 2: fix imports and add stub modules.
diff --git a/Lib/idlelib/TreeWidget.py b/Lib/idlelib/TreeWidget.py
index 5299e0e..876cb0d 100644
--- a/Lib/idlelib/TreeWidget.py
+++ b/Lib/idlelib/TreeWidget.py
@@ -15,7 +15,7 @@
 # - optimize tree redraw after expand of subnode
 
 import os
-from Tkinter import *
+from tkinter import *
 import imp
 
 import ZoomHeight