new example that Matt posted to comp.lang.python
diff --git a/Demo/tkinter/matt/two-radio-groups.py b/Demo/tkinter/matt/two-radio-groups.py
new file mode 100644
index 0000000..f65c8a9
--- /dev/null
+++ b/Demo/tkinter/matt/two-radio-groups.py
@@ -0,0 +1,118 @@
+from Tkinter import *
+
+# The way to think about this is that each radio button menu
+# controls a different variable -- clicking on one of the
+# mutually exclusive choices in a radiobutton assigns some value
+# to an application variable you provide. When you define a
+# radiobutton menu choice, you have the option of specifying the
+# name of a varaible and value to assign to that variable when
+# that choice is selected. This clever mechanism relieves you,
+# the programmer, from having to write a dumb callback that
+# probably wouldn't have done anything more than an assignment
+# anyway. The Tkinter options for this follow their Tk
+# counterparts:
+# {"variable" : my_flavor_variable, "value" : "strawberry"}
+# where my_flavor_variable is an instance of one of the
+# subclasses of Variable, provided in Tkinter.py (there is
+# StringVar(), IntVar(), DoubleVar() and BooleanVar() to choose
+# from)
+
+
+
+def makePoliticalParties():
+ # make menu button
+ Radiobutton_button = Menubutton(mBar, {'text': 'Political Party',
+ 'underline': 0,
+ Pack: {'side': 'left',
+ 'padx': '2m'}})
+
+ # the primary pulldown
+ Radiobutton_button.menu = Menu(Radiobutton_button)
+
+ Radiobutton_button.menu.add('radiobutton', {'label': 'Republican',
+ 'variable' : party,
+ 'value' : 1})
+
+ Radiobutton_button.menu.add('radiobutton', {'label': 'Democrat',
+ 'variable' : party,
+ 'value' : 2})
+
+ Radiobutton_button.menu.add('radiobutton', {'label': 'Libertarian',
+ 'variable' : party,
+ 'value' : 3})
+
+ party.set(2)
+
+ # set up a pointer from the file menubutton back to the file menu
+ Radiobutton_button['menu'] = Radiobutton_button.menu
+
+ return Radiobutton_button
+
+
+def makeFlavors():
+ # make menu button
+ Radiobutton_button = Menubutton(mBar, {'text': 'Flavors',
+ 'underline': 0,
+ Pack: {'side': 'left',
+ 'padx': '2m'}})
+ # the primary pulldown
+ Radiobutton_button.menu = Menu(Radiobutton_button)
+
+ Radiobutton_button.menu.add('radiobutton', {'label': 'Strawberry',
+ 'variable' : flavor,
+ 'value' : 'Strawberry'})
+
+ Radiobutton_button.menu.add('radiobutton', {'label': 'Chocolate',
+ 'variable' : flavor,
+ 'value' : 'Chocolate'})
+
+ Radiobutton_button.menu.add('radiobutton', {'label': 'Rocky Road',
+ 'variable' : flavor,
+ 'value' : 'Rocky Road'})
+
+ # choose a default
+ flavor.set("Chocolate")
+
+ # set up a pointer from the file menubutton back to the file menu
+ Radiobutton_button['menu'] = Radiobutton_button.menu
+
+ return Radiobutton_button
+
+
+def printStuff():
+ print "party is", party.get()
+ print "flavor is", flavor.get()
+ print ""
+
+#################################################
+#### Main starts here ...
+root = Tk()
+
+
+# make a menu bar
+mBar = Frame(root, {'relief': 'raised',
+ 'bd': 2,
+ Pack: {'side': 'top',
+ 'fill': 'x'}})
+
+# make two application variables,
+# one to control each radio button set
+party = IntVar()
+flavor = StringVar()
+
+Radiobutton_button = makePoliticalParties()
+Radiobutton_button2 = makeFlavors()
+
+# finally, install the buttons in the menu bar.
+# This allows for scanning from one menubutton to the next.
+mBar.tk_menuBar(Radiobutton_button, Radiobutton_button2)
+
+b = Button(root, {"text": "print party and flavor",
+ "command" : printStuff,
+ "fg": "red"})
+b.pack({"side" : "top"})
+
+root.title('menu demo')
+root.iconname('menu demo')
+
+root.mainloop()