fix a lot of Tkinter imports
diff --git a/Demo/tkinter/matt/canvas-w-widget-draw-el.py b/Demo/tkinter/matt/canvas-w-widget-draw-el.py
index 3cbf937..ca96583 100644
--- a/Demo/tkinter/matt/canvas-w-widget-draw-el.py
+++ b/Demo/tkinter/matt/canvas-w-widget-draw-el.py
@@ -1,4 +1,4 @@
-from Tkinter import *
+from tkinter import *
 
 # this file demonstrates the creation of widgets as part of a canvas object