enumListBoxSelectionType

typedef enum
{
    listboxtype_singleselection   = 0, // List box type, single selection
    listboxtype_multipleselection = 1, // List box type, multiple selection
    listboxtype_extendedselection = 2  // List box type, extended selection

} enumListBoxSelectionType;

used in IXlsFormListBox::SelectionType property.