printing with MFC/OpenGL

Hi Guys

I do not want to print with background color = black. Because of that, I 
change background color (to white), in the last rendering for printing.

OnDraw

     if (pDC->IsPrinting())
    {
        glDrawBuffer(GL_BACK);
        glClearColor(1,1,1,1);
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
        RenderScene();
        glFlush();
        glReadBuffer(GL_BACK);
        glReadPixels(0,0,vpWidth,vpHeight,GL_RGB, GL_UNSIGNED_BYTE, buffer);
        //...
        // swapbuffers here
    }
    else
    {
        glDrawBuffer(GL_BACK);
        glClearColor(1,0,1,1);
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
        //...
    }


I do not know, why the print preview  has black background... I have not 
printed the image yet, but I think if the print preview has black 
background, the printed image will.

I am using CG fragment program for rendering.

THX
Rix 

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