BCGControlBar Pro for MFC
virtual void CBCGPVisualManager::OnDrawRibbonComboDropButton ( CDC *  pDC,
CBCGPRibbonComboBox pComboBox,
CRect  rect,
BOOL  bIsDisabled,
BOOL  bIsDroppedDown,
BOOL  bIsHighlighted 

Called by the framework to draw ribbon combobox drop button.

pDCA pointer to a device context.
pComboBoxA pointer to combo box.
rectThe bounding rectangle.
bIsDisabledTRUE if the button is disabled.
bIsDroppedDownTRUE if the button is dropped down.
bIsHighlightedTRUE if the button is highlighted.