constants SortOnClickEnum
Specifies the action that control takes when the user clicks the column's header. Use the SortOnClick property to specify the action that control takes when user clicks on the column's header.

NameValueDescription
exNoSort0 The control does nothing when user clicks the column's header.
exDefaultSort-1 The control sorts the column when user clicks the column's header. 
exUserSort1 The control displays the sort icon as it been sorted, but the column is not sorted.