The ApplyFilter method updates the control's content once that user sets the filter using the Filter and FilterType properties. Use the ClearFilter method to clear the control's filter. Use the DisplayFilterButton property to show the filter drop down button in the column's caption. Use the FilterInclude property to specify whether the child items should be included to the list when the user applies the filter. Use the FilterCriteria property to filter items using the AND, OR and NOT operators. Use the ShowFilter method to show programmatically the column's drop down filter window. The VisibleItemCount property specifies the number of visible items in the list. The control fires the FilterChanging event just before applying the filter, and  FilterChange once the list gets filtered.