This method is used to display an instance of a PopupTool that is sited/owned by an UltraToolbar or PopupMenuTool such that it displays as it would if the popup were displayed using the keyboard or mouse.
Note: This method will throw an System.InvalidOperationException if the tool is not visible, if the tool is a root tool (i.e. it is not on a toolbar or menu), if the owning toolbar is hidden or if the owning menu is itself not open.
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Server 2012, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2