If the header is shown on the top or bottom of the UltraTile, this value indicates the height of the header. If the header is shown on the left or right of the UltraTIle, this value indicates the width of the header. If the header is hidden, this value is ignored.
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