Create an 'instance' of the content hierarchy and group the new hierarchy with this hierarchy.
If the instance is subsequently attached to the same document, the state of all members
of the group will be kept synchronized. With the exception of the instance ids, all
state is exactly preserved in the new instance hierarchy.
\note The grouping will have no effect until the new instance is attached to the same document.
RhinoCommon (in RhinoCommon.dll)
public RenderContent MakeGroupInstance()
Public Function MakeGroupInstance As RenderContent
A grouped instance of the content hierarchy.