[vtkusers] Vertex Position from vtkGraphLayoutView ? vtkRenderedGraphRepresentation::Layout is protected

[KrishnaPG]

Hello, 

How to access the polydata information of the graph laid out and displayed
by the vtkGraphLayoutView ? 

The vtkRenderedGraphRepresentation::Layout->GetGraphOutput() should give
access to the vtkGraph object  - but vtkRenderedGraphRepresentation::Layout
is declared as protected and no copy-constructor or assignment operator !!

Is this a bug?

How to access the rendered graph post-layout vertices of the
vtkGraphLayoutView?

Thank you.

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