BCGControlBar Pro for MFC
Enumerator
BCGP_RIBBON_COMBO_SORT_ORDER_NO_SORT 

The combo box is not sorted.

BCGP_RIBBON_COMBO_SORT_ORDER_ASC 

The combo box has ascending sort order.

BCGP_RIBBON_COMBO_SORT_ORDER_DESC 

The comb box has descending sort order.