The "chart area" refers to the area on the right side of the control in which the timeline and task bars are displayed.
Changing the value of the ChartAreaWidth property also affects the GridAreaWidth property since the client area of the control is divided among these two areas.
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