BCGControlBar Pro for MFC
void CBCGPPopupWindow::SetSmallCaption ( BOOL  bSmallCaption = TRUE,
BOOL  bLargeCaptionFont = FALSE 

Switches between small and normal captions.

Call this function to display the small or normal caption. The small caption has 7 pixels height (by the default, at 96 DPI). The normal caption is obtained from the OS using GetSystemMetrics (SM_CYSMCAPTION);

bSmallCaptionIf TRUE, the popup window will display the small caption.
bLargeCaptionFontIf TRUE and caption is large, the caption text will be drawn using large font.