How to use the GnomeAppBar

[Travis Miller <raphtee gmail com>]

I've been using GTK+ for a short time now, and I'm still trying to
figure out some of the little things.  (So far I've found this to
be an excellent source of great information so thanks to everyone who
has helped me in the past).  Anyway, I added a GnomeAppBar at the
bottom of my app because I wanted to use its progressbar
(GtkProgressBar *).  So when I call
gtk_progress_bar_set_fraction() in a loop, nothing happens (that I can
see).  Basicly all I end up seing is the last call to
gtk_progress_bar_set_fraction().  Am I required to make some call
to force it to update on each call inside the while loop?

Thanks for any help,
Travis Miller