fix a lot of Tkinter imports
diff --git a/Demo/tkinter/matt/window-creation-simple.py b/Demo/tkinter/matt/window-creation-simple.py
index fdf1dcc..f5e6230 100644
--- a/Demo/tkinter/matt/window-creation-simple.py
+++ b/Demo/tkinter/matt/window-creation-simple.py
@@ -1,4 +1,4 @@
-from Tkinter import *
+from tkinter import *
 
 # this shows how to spawn off new windows at a button press