The ExpandAll method expands all items in the collection. The Expanded property specifies whether the item is expanded or collapsed. The CollapseAll method expands all items in the collection. The LinesAtRoot property link items at the root of the hierarchy. The FaceTreeExpandItem event notifies once the item is expanded or collapsed. The HasButtons property specifies whether the control displays any glyph next to the collapsed/expanded element. The Background(exTreeGlyphCollapsed) / Background(exTreeGlyphExpanded) property specifies the visual appearance to show the glyph next to the collapsed/expanded element.