The SelectedTabItem represents the item from the Items collection that is the currently selected tab item. The content of the currently selected tab item is displayed on the right hand side of the control. The property is updated as the end user selects tab items in the left side of the control. When the ApplicationMenu2010 is closed, the property is set to null so that the menu will open with the default tab item the next time it opens.
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