agw/aui framemanager - set two windows to equal size

I have two windows managed by agw/aui and would like to know the proper way to set the two windows to equal size programatically. That is, regardless of the size of the windows or the size of the main app window, if the user clicks a button it will resize the windows to equal size with the sash down the middle. Also, is it possible for these two windows to remain equal in size when the app window is resized?

I have looked at the docs at BestSize, etc., but cannot find a clear-cut method of doing this (unless I am overlooking it). Any help is appreciated.

Regards,
Tim