Expanding tkinter widgets to fill the window

[KDawg44]

Hi,

I am writing a GUI front end in Python using Tkinter.  I have
developed the GUI in a grid and specified the size of the window.  The
widgets are centered into the middle of the window.  I would like them
to fill the window.  I tried using the sticky=E+W+N+S option on the
widgets themselves and the window itself.

How can I get this?

Thanks.