fix a lot of Tkinter imports
diff --git a/Demo/tkinter/matt/rubber-band-box-demo-1.py b/Demo/tkinter/matt/rubber-band-box-demo-1.py
index 66b8f8b..48526d8 100644
--- a/Demo/tkinter/matt/rubber-band-box-demo-1.py
+++ b/Demo/tkinter/matt/rubber-band-box-demo-1.py
@@ -1,4 +1,4 @@
-from Tkinter import *
+from tkinter import *
 
 class Test(Frame):
     def printit(self):