[HELP] Tkinter Application Minimized to System Tray :)

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I write a program with Python 2.4 + Tkinter
Execute it, there will be a window show something.
If I minimize it, it will be minimized to the taskbar. But I would like
it to miniminze to the System Tray, this can make taskbar more clear. Would
you please tell me how to modify my program.

Thanks a lot !!

Soure Code :

# Display digits of pi in a window, calculating in a separate thread.
# Compare with wpi.py in the Demo/threads/wpi.py

import sys
import time
import thread
from Tkinter import *

class ThreadExample:
def __init__(self, master=None):
self.ok = 1
self.digits = []
self.digits_calculated = 0
self.digits_displayed = 0
self.master = master

thread.start_new_thread(self.worker_thread, ())

self.frame = Frame(master, relief=RAISED, borderwidth=2)
self.text = Text(self.frame, height=26, width=50)
self.scroll = Scrollbar(self.frame, command=self.text.yview)
self.text.configure(yscrollcommand=self.scroll.set)
self.text.pack(side=LEFT)
self.scroll.pack(side=RIGHT, fill=Y)
self.frame.pack(padx=4, pady=4)
Button(master, text='Close', command=self.shutdown).pack(side=TOP)

self.master.after(100, self.check_digits)

def worker_thread(self):
while self.ok:
self.digits.append(`9`)
time.sleep(0.001)

def shutdown(self):
self.ok =0
self.master.after(100, self.master.quit)

def check_digits(self):
self.digits_calculated = len(self.digits)
diff = self.digits_calculated - self.digits_displayed
ix = self.digits_displayed
for i in range(diff):
self.text.insert(END, self.digits[ix+i])
self.digits_displayed = self.digits_calculated
self.master.title('%d digits of pi' % self.digits_displayed)
self.master.after(100, self.check_digits)

root = Tk()
root.option_readfile('optionDB')
example = ThreadExample(root)
root.mainloop()

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