Tkinter: Scrollable buttons

[sragsdale at my-deja.com]

I've got a big panel full of buttons and such, and I need to add a
scroll bar so that I can move up and down the list.  The following code
will construct something that _looks_ good, but the scrollbar won't
actually do anything.  Any idea what's wrong?

#######################################################
#!/usr/local/bin/python

from Tkinter import *

class App(Frame):
    def __init__(self,parent):
        Frame.__init__(self,parent)
        self.pack(expand=YES,fill=BOTH)

        items = Canvas(self)
        items.pack(anchor=N, expand=YES, fill=BOTH)

        scroll = Scrollbar(items)
        scroll.config(command=items.yview, relief=SUNKEN)
        scroll.pack(side=RIGHT, fill=Y)

        items.config(yscrollcommand=scroll.set, relief=SUNKEN)

        for i in range(1,100):
            b = Button(items,text=str(i))
            b.pack()

myapp = App(None)
myapp.mainloop()


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