fix a lot of Tkinter imports
diff --git a/Demo/tkinter/matt/dialog-box.py b/Demo/tkinter/matt/dialog-box.py
index 0c71c3a..c0b8825 100644
--- a/Demo/tkinter/matt/dialog-box.py
+++ b/Demo/tkinter/matt/dialog-box.py
@@ -1,5 +1,5 @@
-from Tkinter import *
-from Dialog import Dialog
+from tkinter import *
+from tkinter.dialog import Dialog
 
 # this shows how to create a new window with a button in it
 # that can create new windows