Called after all non-highlighted objects have been drawn and PostDrawObjects has been called.
Depth writing and testing are turned OFF. If you want to draw with depth writing/testing,
RhinoCommon (in RhinoCommon.dll)
public static event EventHandler<DrawEventArgs> DrawForeground
Public Shared Event DrawForeground As EventHandler(Of DrawEventArgs)
This event is actually passed a DrawForegroundEventArgs, but we could not change
the event declaration without breaking the SDK. Cast to a DrawForegroundEventArgs
if you need it.