Scrolled window resizing question.

[pjdavis engineering uiowa edu]

Does anyone know how to make a scrolled window stop expanding once the need for
a scrollbar is gone?  I've been playing around with some different things but I
can't figure this one out.

The goal is to have a scrolled window that will expand while it still needs a
scrollbar, and then once the scroll bar dissappears, the widget stops expanding
with further expansion of the containing widget.

Thanks,
Paul Davis