That method will modify CustomLabelsText. A call to that method will automatically disable NumberOfLabels property and number of labels will be defined by content of CustomLabelsText property.
Target Platforms: Windows 10, Windows 8.1, Windows 8, 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