Custom panel refresh rates

[James Bigler]

I have a wxWidgets application I'm building on windows.  I have 3 OpenGL 
panels in the main frame for which I'm using Open Scene Graph for the 
OpenGL stuff.

In my application I'm able to select an object and move it about.  As I 
do so I call Refresh() for each of my custom OpenGL panels to get them 
to redraw the new updated content.

The problem I'm seeing is that the first of the panels to redraw gets 
updates significantly more often than the second which gets more than 
the third (a sample ratio is 297/48/21).  I tried taking out the code 
that does all the rendering and swaps the buffers, but that had no effect.

I traced into Refresh() and it makes some windows API calls 
(::RedrawWindow(hWnd, pRect, NULL, flags)).  How does Windows determine 
which windows to refresh?  Is there a way I can get all the windows to 
refresh equally?

I'm running on WinXP using wxWidgets 2.6.3 and VS2005 Express Edition.

Thanks,
James