The PositionMode property controls the vertical position of the surface,
when it is rendered in flat mode (DrawFlat property is set to True).
The following code sets one of the available modes:
surface.PositionMode = SurfacePositionMode.AxisEnd
surface.PositionMode = SurfacePositionMode.AxisEnd;
Target Platforms: 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