Python20, tcl8.3.2 , IDLE 0.6, mainloop doesn't terminate

[stefan kusch]

Hi folks,
I've got the following problem running a python20/ tcl8.3.2 Tkinter
application 
in python shell IDLE 0.6 under windows 2000SP1.

My programm generates a window with a button.
When pushing the button the program should terminate, but
tk.mainloop() doesn't.
The problem only appear running the program under python shell IDLE
0.6. 
Running the program with the command line interpreter is working
correctly.

where is the error?
who knows an answer?

Thanks a lot
Stefan

------ Sample Code ----------
import Tkinter
from Tkconstants import *
tk = Tkinter.Tk()
frame = Tkinter.Frame(tk, relief=RIDGE, borderwidth=2)
frame.pack(fill=BOTH,expand=1)
button = Tkinter.Button(frame,text="Exit",command=tk.destroy)
button.pack(side=BOTTOM)
tk.mainloop()
-----------------------------