fix a lot of Tkinter imports
diff --git a/Demo/tkinter/guido/imageview.py b/Demo/tkinter/guido/imageview.py
index d6efed0..276858a 100755
--- a/Demo/tkinter/guido/imageview.py
+++ b/Demo/tkinter/guido/imageview.py
@@ -1,4 +1,4 @@
-from Tkinter import *
+from tkinter import *
 import sys
 
 def main():