BCGControlBar Pro for MFC
void CBCGPRibbonButtonsGroup::SetImages ( CBCGPToolBarImages pImages,
CBCGPToolBarImages pHotImages,
CBCGPToolBarImages pDisabledImages,
BOOL  bDontScaleInHighDPIMode = FALSE 

Assigns images to buttons in group.

You should call SetImages before you add buttons to a group. The number of images should be greater or equal to the number of buttons to be added to the group.

pImagesRegular images.
pHotImagesHot images.
pDisabledImagesDisabled images.
bDontScaleInHighDPIModeSet this parameter to TRUE if you wish to prevent image scaling in high DPI mode.