The Expanded property expands programmatically a column. The ExpandColumns property specifies the list of columns to be shown when the current column is expanded. The DisplayExpandButton property specifies whether the column's header displays a +/- ( expanding button ), to let user expands or collapse the column, when it is clicked. The control fires the LayoutChanged event when the user expands or collapse a column. Use the ExpandItem property to expand or collapse an item. The Index property indicates the column's index. The Visible property specifies whether a column is Visible or hidden.