Please see TreeListView Sorting Specifics.
To sort nodes by a column's values and replace existing sort conditions that are applied to the current or other column(s), click the target column's header, until an UP or Down Arrow icon is displayed within the header. The Up and Down Arrows indicate ascending and descending sort orders, respectively.
To sort nodes by a column's values preserving existing sort conditions, do one of the following:
- Click a column's header holding the SHIFT key down, until an UP or Down Arrow icon is displayed within the header.
Right-click a column's header and select Sort Ascending or Sort Descending from the context menu.
To remove sorting by a column, click a column header while holding the CTRL key down.