refresh window's background/mask

FROM : Craig Hunter
DATE : Sat Apr 23 19:28:43 2005

I have a transparent window in my app, and I want to be able to turn the
transparency on/off with a checkbox.  I am able to do that for the most
part.  If the window starts out as transparent, I can toggle back and forth
between transparent and opaque no problem.  If the window starts out opaque,
toggling back and forth between opaque and transparent has no visible effect
unless I first hide/show the window manually in a transparent state.  I
believe it's an issue with the window's mask.

I am calling a window update whenever the mode is changed, which is
definitely required to have any effect.  But nothing I have tried forces the
background/mask to refresh when the window starts out opaque.  Any ideas?

thanks,
Craig

--
Dr. Craig A. Hunter
NASA Langley Research Center
AAAC / Configuration Aerodynamics Branch
(757) 864-3020
craig.<email_removed>