When set to true, the Opened event will be raised and the menu will be displayed to the end user. The SelectedTab will be set to null as occurs in Office when the Backstage is displayed. If the end user clicks the file tab or presses Escape, the menu will be closed and the previously selected tab item will be restored. If the end user selects another tab, the menu will be closed and that tab item will be displayed within the ribbon.
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Server 2012, 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