Use the SelectColumnInner property to get the index of the inner cell that's selected or focused. The SelectColumnInner property may be greater than zero, if the control contains inner cells. The SplitCell method splits a cell in two cells. The newly created cell is called inner cell. The FocusItem property indicates the focused item. The SelectColumnIndex property determines the index of the column that's selected when FullRowSelect property is False. Use the SelectableItem property to specify the user can select an item.