Class: TEgDBGridEx
property SortDirection: TSortDirection default sdAscending;Direction of the currently active sort (sdAscending or
sdDescending), shown by the arrow drawn on SortSelectedField’s
column title. Clicking that title again toggles this value (subject to
SortFields
allowing the new direction); clicking a different sortable column’s
title sets SortSelectedField to that column without
necessarily changing SortDirection. See TSortDirection.