Hi Im new to gui programming

from Tkinter import *                          # get widget classes
from tkMessageBox import askokcancel           # get canned std dialog

class Quitter(Frame):                          # subclass our GUI
     def __init__(self, parent=None):           # constructor method
         Frame.__init__(self, parent)
         self.pack()
         widget = Button(self, text='Quit', command=self.quit)
         widget.pack(side=LEFT)
     def quit(self):
         ans = askokcancel('Verify exit', "Really quit?")
         if ans: Frame.quit(self)

class Demo(Frame):
     def __init__(self, parent=None):
         Frame.__init__(self, parent)
         self.pack()
         Label(self, text="Basic demos").pack()
         for (key, value) in demos.items():
             func = (lambda key=key: self.printit(key))
             Button(self, text=key, command=func).pack(side=TOP, fill=BOTH)
         Quitter(self).pack()    # here
     def printit(self, name):
         print name, 'returns =>', demos[name]()


My problem is in class Demo. How is the best way to use class Quitter in 
class Demo?
should it be:
Quitter(self).pack()
Quitter(self)
...
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