Tkinter: centering windows on screen

[Kevin Cazabon]

I'm having a bit of a problem controlling where on screen a Toplevel() or
Tk() widget appears on the screen...

I have some large widgets that sometimes appear partially off-screen, and I
want to make sure that (at least) they're centered.

Any pointers to the best solution would be appreciated... I've searched
through Fred's Tkinter manual online, but no luck.

Kevin.