fix a lot of Tkinter imports
diff --git a/Demo/tkinter/guido/newmenubardemo.py b/Demo/tkinter/guido/newmenubardemo.py
index 57bf13c..51c4e64 100644
--- a/Demo/tkinter/guido/newmenubardemo.py
+++ b/Demo/tkinter/guido/newmenubardemo.py
@@ -2,7 +2,7 @@
 
 """Play with the new Tk 8.0 toplevel menu option."""
 
-from Tkinter import *
+from tkinter import *
 
 class App: