The same question about screen flash

I currently using openl with motif.When drawing my image,it flash hard(include GL stuff and Xt/X stuff).
I know double buffer can deal with GL stuff.But how do deal with the no_GL parts?
If i draw the no_Gl parts to a pixmap,then copy it to the screen window,then how to deal with the GL parts?
Can both the GL parts and the no_GL parts be drawn into one buffer or one glPixmap?If so,how to copy it to the render screen?
Thanks a lot.Your code is welcome.

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