| from tkinter import * | 
 |  | 
 |  | 
 | class Test(Frame): | 
 |     def createWidgets(self): | 
 |  | 
 |         self.Gpanel = Frame(self, width='1i', height='1i', | 
 |                             background='green') | 
 |  | 
 |         # this line turns off the recalculation of geometry by masters. | 
 |         self.Gpanel.propagate(0) | 
 |  | 
 |         self.Gpanel.pack(side=LEFT) | 
 |  | 
 |         # a QUIT button | 
 |         self.Gpanel.QUIT = Button(self.Gpanel, text='QUIT', foreground='red', | 
 |                                   command=self.quit) | 
 |         self.Gpanel.QUIT.pack(side=LEFT) | 
 |  | 
 |     def __init__(self, master=None): | 
 |         Frame.__init__(self, master) | 
 |         Pack.config(self) | 
 |         self.createWidgets() | 
 |  | 
 | test = Test() | 
 |  | 
 | test.master.title('packer demo') | 
 | test.master.iconname('packer') | 
 |  | 
 | test.mainloop() |