These bounds are relative to the top-left of the BrushElement's target rectangle. Dimensions can be specified in pixels or as a percentage of the target rectangle. Use the RelativeClipBoundsMeasure property to set the coordinate system being used.
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