By default, the HasButton property is True. Use the HasButton property to hide the +/- buttons for a particular node. Use the HasButtons property to display +/- buttons for parent nodes. The node displays the +/- button only if the node contains child nodes, and the HasButton property is True. Use the ExpandOnDblClick property to specify whether a node is expanded or collapsed when the user double clicks it. Use the EnsureVisibleNode method to ensure that a node fits the control's visible client area. Use the SelectNode property to select a node. The Expanded property sets or returns whether a node in the hierarchy is expanded. Use the Parent property to get the parent node. Use the ButtonsAlign property to align the +/- expand buttons in the node.