Header Filter
Row headers can display Excel-style filter buttons. Clicking a filter button invokes the header filter popup window that enables you to apply filter criteria against this row.
The header filter can operate in one of four modes: the List and CheckedList modes are available for all grid rows; the DateRangeCalendar and DateRangePicker modes are available for date rows only.
The mode is specified at the row level using the GridDataColumnHeaderFilterSettings.Mode property.
