[vtkusers] Add vtkGraphLayoutview object to QvtkWidget

[ankit lat]

I am trying to add a vtkGraphLayoutView into a QVTK widget so that I can
connect a custom vtk callback command to the QT signals and slots.
Specifically I need to add an observer to the annotation link to update
selections.
Previously I set up the callback with this code:

    selectionCallback = vtkSmartPointer<vtkCallbackCommand>::New();
    selectionCallback->SetClientData(this);
    selectionCallback->SetCallback (SelectionCallbackFunction);

graphLayoutView->GetRepresentation()->GetAnnotationLink()->AddObserver("AnnotationChangedEvent",
selectionCallback);

How would I add the GraphLayout View to a QTMainWindow and maintain the
ability to create custom callbacks as if it were a normal renderWindow?

Thanks
Ankit
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