Tkinter rename, step 2: fix imports and add stub modules.
diff --git a/Lib/idlelib/UndoDelegator.py b/Lib/idlelib/UndoDelegator.py
index 5896bd5..544be10 100644
--- a/Lib/idlelib/UndoDelegator.py
+++ b/Lib/idlelib/UndoDelegator.py
@@ -1,5 +1,5 @@
 import string
-from Tkinter import *
+from tkinter import *
 from Delegator import Delegator
 
 #$ event <<redo>>