Invoke this method to reset the SelectedItemKey property to its default value.
Once this method is invoked, the ShouldSerializeSelectedItemKey method will return False until the SelectedItemKey property is set again.
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