fix a lot of Tkinter imports
diff --git a/Demo/tkinter/matt/packer-simple.py b/Demo/tkinter/matt/packer-simple.py
index 1a505dd..64f61d5 100644
--- a/Demo/tkinter/matt/packer-simple.py
+++ b/Demo/tkinter/matt/packer-simple.py
@@ -1,4 +1,4 @@
-from Tkinter import *
+from tkinter import *
 
 
 class Test(Frame):