Fix-up some tkinter demos.
diff --git a/Demo/tkinter/guido/AttrDialog.py b/Demo/tkinter/guido/AttrDialog.py
index 5508e3b..44d9766 100644
--- a/Demo/tkinter/guido/AttrDialog.py
+++ b/Demo/tkinter/guido/AttrDialog.py
@@ -120,7 +120,7 @@
                 cl = self.classes[c]
             except KeyError:
                 cl = 'unknown'
-            if type(cl) == TupleType:
+            if type(cl) == tuple:
                 cl = self.enumoption
             elif cl == 'boolean':
                 cl = self.booleanoption