Sets the tooltip text for an item in the gallery.
void SetItemToolTip(
    int nItemIndex,
    LPCTSTR lpszToolTip 
);
Parameters
- [in] nItemIndex 
 The zero-based index of the palette item with which to associate the tooltip.
- [in] lpszToolTip 
 The text to appear on the tooltip.
Requirements
Header: afxRibbonPaletteGallery.h