By default, the HoistItem property is 0, meaning no item is hoisted and all rows are displayed in their normal hierarchical structure. The HoistItem property gets or sets the handle of the row to be hoisted. A hoisted row is promoted from its current position in the hierarchy and displayed as a top-level row, without modifying its content or properties. All visible child rows of the hoisted row are also promoted and displayed at the top level, while maintaining their relative hierarchy to the hoisted row. 

By default, 

• hoisting an item also displays all of its parent rows up to the root. To restrict the view so that only the hoisted item and its visible children are shown, set the FilterInclude property to exMatchingItemsOnly
• when an item is hoisted, all of its child rows are automatically expanded. To preserve their original expand/collapse state, use the Layout property to save the current layout before changing the hoist, and restore it immediately afterward.

For reference, related properties such as SelectedItem, FocusItem, and ItemByIndex return the currently selected row, the row with focus, or the row identified by its index, respectively.