refreshing canvas after scroll

[Brian Craft <bcboy thecraftstudio com>]

Hey -- Just built a little app with glade & libglade that has
a GnomeCanvas widget. The widget does not refresh after being
scrolled with the scrollbars that glade adds. So when you scroll
you end up with big blank areas that can only be drawn by resizing
the window to force a redraw.

What gives?

b.c.