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 | protectedvirtual | 
Called by the framework to display an image on the caption bar.
Override this member function in a CBCGPCaptionBar - derived class to customize the image appearance. The image is set either by SetIcon() or SetBitmap().
| pDC | A pointer to a device context used to display the image. | 
| rect | Specifies the bounding rectangle of the image. |