CGXComboBoxWnd::m_bFillWithChoiceList
BOOL m_bFillWithChoiceList;
Remarks
TRUE if list box items are retrieved from choice list (default). FALSE if list box is filled by overriding OnFillDroppedList.
If you want to fill the list box part at runtime in an overridden OnFillDroppedList method, you should assign FALSE to m_bFillWithChoiceList in the constructor of your derived class.