BCGControlBar Pro for MFC
int CBCGPToolbarComboBoxButton::GetCurSel ( ) const
inline

Retrieves the index of the currently selected item, if any, in the list box of a combo box.

Returns
The zero-based index of the currently selected item in the list box of a combo box, or CB_ERR if no item is selected.

Call this member function to determine which item in the combo box portion of the button is selected. GetCurSel returns an index into the list.