Use the SortBarVisible property to show the control's sort bar. By default, the SortBarVisible property is False. Use the SingleSort property to specify whether the control supports sorting by single or multiple columns. Sorting by a single column in the control is a simple matter of clicking on the column head. Sorting by multiple columns, however, is not so obvious. But it's actually quite easy. The user has two options to sort by multiple columns:

• First, sort by the first criterion, by clicking on the column head. Then hold the SHIFT key down as you click on a second heading. 
• Click the column head and drag to the control's sort bar in the desired position.