How to resize a widget?

[<learfox furry ao net>]

   I have a child widget that I need to change its size with in the middle
of run time.

   The first call to gtk_widget_set_usize() works when I have the
widget shown (gtk_widget_show()).

But at some random point while my app is running, I call
gtk_widget_set_usize() again to change its size.  But it has no affect
untill I manually adjust it's toplevel GtkWindow with the pointer.

Is there a way to force a widget to take on a new size (this is a
GtkGLArea widget)?

--
Sincerely,                  ,"-_                         \|/
-Capt. Taura M.             ,   O=__                    --X--
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                  http://furry.ao.net/~learfox/