* 
 * @since 3.2
 */
public void setSortDirection (int direction) {
	checkWidget ();
	if (direction != SWT.UP && direction != SWT.DOWN && direction != SWT.NONE) return;
	sortDirection = direction;
	if (sortColumn == null || sortColumn.isDisposed ()) return;
	sortColumn.setSortDirection (sortDirection);
}