If the label text is null or empty, no label will be shown for the row.
If the label text is a string, it will display that string above the row.
If the label text is a single dash ("-") a separator line will be shown above the row.
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