Updating A Tkinter Window every 100 ms?

[Josiah]

I would like to create the TK dialog with a "Update" function that
will run every 100 ms. A self calling function. Inside this fuction, I
want to call "lift()" to keep the window on top of all the others, and
I want to call another function that will update other things.
 Could some look at my sample code and please give me some feedback?
Is there a better way? Why does the "lift()" function not work with
"self.master.lift()"?

Thanks for any help with this.
Josiah


##############################################################
from Tkinter import *

class App:
 def __init__(self, master):
   frame = Frame(master) 
   frame.grid()

 def Do_Stuff(self):
   pass 

 def Update(self):
   self.Do_Stuff() 
   root.lift() 
   root.after(100, self.Update)

root = Tk()
app = App(root)
app.Update()
root.mainloop()
###############################################################