Use the FilterChange event to notify your application that the control's filter is changed. The FilterChanging event occurs just before applying the filter. Use the Filter and FilterType properties to retrieve the column's filter string, if case, and the column's filter type. The ApplyFilter and ClearFilter methods fire the FilterChange event. Use the DisplayFilterButton property to add a filter bar button to the column's caption. Use the FilterBarHeight property to specify the height of the control's filter bar. Use the FilterBarFont property to specify the font for the control's filter bar. Use the VisibleItemCount property to retrieve the number of filtered items. Use the FilterBarCaption property to change the caption in the filter bar once a new filter is applied.