This property indicates the item that should be chosen as the selected tab when the ApplicationMenu2010 opens. When the menu opens and the SelectedTabItem is null, this property is used to initialize the SelectedTabItem. When the menu closes, the SelectedTabItem is set to null and the next time the menu opens it will use the value of the InitialSelectedTabItem.
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