Tkinter in thread hangs on windows but not on Linux

This example worked for me on Windows 2000, after inserting

import threading
from Tkinter import *
import ScrolledText
at the top.

Hi,

I need to pop-up in a "modless" manner some windows from an existing
Tkinter loop. The following code works OK under Linux: the second window
opens, shows the information, and quits cleanly when destroyed. However,
under windows, I get the second window without the content (so I hang in
run I guess), and both the thread and the calling process hang.

Any clue ?

Thanks
Philippe

#************** *************** *************** *************** *************** *****
class SC_DOCS(threadi ng.Thread):
__m_smg = None
__m_title = None
def __init__(self,p _msg,p_title):
threading.Threa d.__init__(self )
self.__m_msg = p_msg
self.__m_title = p_title

#************** *************** *************** *************** *************** *****
def run (self):
l_r = Tk()
l_r.title(self. __m_title)
l_f = Frame(l_r)
l_f.pack(side=T OP, expand=YES, fill=BOTH)
l_st = ScrolledText(l_ f)
l_st.pack(side= TOP, expand=YES, fill=BOTH)
l_st.insert(END ,self.__m_msg)

l_r.mainloop()
.
.
.

l_d = SC_DOCS('A MESSAGE', 'A TITLE')
l_d.start()
.
.
.