By default, the list containing the unique field values is sorted in an ascending order. However, to sort the list items by a different order, you can make use of the SortOrder property of the C1FlexPivotSlicer class. This property accepts values such as Ascending, Descending or Unspecified from the SortOrder enum and allows you to display the list items in ascending order, descending order or unsorted state. The Change sort direction button can be displayed in the header by setting the ShowSort property of the C1FlexPivotSlicer class to true.