Stupid Tkinter question

[Bjoern Giesler]

Hi,

I want to display a button in my application that shows a bitmap (.xbm).
I'm going crazy. Why does this fragment work (adapted from imageview.py
in Guido's Tkinter demos):

[snip]
#!/usr/bin/env python

from Tkinter import *
import sys

def main():
    filename = sys.argv[1]
    root = Tk()
    img = BitmapImage(file=filename)
    label = Button(root, text=filename, image=img, command=sys.exit)
    label.pack()
    root.mainloop()

main()
[snip]

.... but this doesn't:

[snip]
#!/usr/bin/env python

from Tkinter import *
from sys import *

def makeToolbar(aFrame):
    toolbar = Frame(aFrame)
    markimage = BitmapImage(file = "Mark.xbm")
    markbutton = Button(toolbar,
                        image = markimage,
                        command = exit)

    markbutton.pack()
    return toolbar

def makeUI(anApp):
    frame = Frame(anApp)
    toolbar = makeToolbar(frame)

    toolbar.pack()
    frame.pack()

app = Tk()
makeUI(app)
app.mainloop()     
[snip]

As far as I can see, the two are doing exactly the same. The first
example displays the bitmap, and the button is clickable, the second
displays a button the size of the bitmap, but which has nothing in it,
and which isn't clickable.

HELP!

TIA,
		--Bjoern
PS Python 1.5.1 on Linux, if that is important.
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