BCGControlBar Pro for MFC
void CBCGPRibbonComboGalleryCtrl::AddCommand ( UINT  uiCmdID,
LPCTSTR  lpszString,
BOOL  bOnTop = FALSE 
)

Adds a command (located on top or bottom of the gallery).

Parameters
uiCmdIDIdentifier for the command.
lpszStringSpecifies a command name.
bOnTopSpecifies where the command should be added: TRUE - on top or FALSE - on bottom