Need help with Tkinter

[rodzilla2000 at my-deja.com]

I'm trying to learn python/Tkinter...

I tried modifying the hello.py script that guido included in the 1.5.2
source.

Here's what I was trying to do (to learn while tinkering...)

Change the "Hello World" button a "Add Exit Button" that would put
another button on the screen to allow exiting the program.

Add the additional exit button...

Here's the code:

=========START OF CODE
# Button test...

import sys
from Tkinter import *

#main routine
def main():
    root=Tk()
    btnAddButton=Button(root)
    btnAddButton['text']='Add Exit Button'
    btnAddButton['command']=subAddButton(root)   # See below
    btnAddButton.pack()

    #start mainloop
    root.mainloop

def subAddButton(parent):
    btnExitButton=Button(parent)
    btnExitButton['text']='Exit Program'
    btnExitButton['command']=subExit   #see below
    btnExitButton.pack()

def subExit():
    sys.exit(0)


#execute the main routine
main()
==========END OF CODE

When I run this code, the exit button is already displayed.  The "Add
Exit Button" button seems to do nothing, I would have thought it would
keep adding more exit buttons...


I ran the code through the debugger and it looks like the "Exit" button
gets drawn even before the "Add Exit Button" button gets drawn...


Cany anybody enlighten me?

Thanx...


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