_boxWidgetS1->AddObserver(vtkCommand::InteractionEvent, callback);
callback->Delete();
_boxWidgetS1->EnabledOn();
_boxWidgetS1->GetSelectedFaceProperty()->SetOpacity(0.0);
_boxWidgetS1->AddObserver(vtkCommand::InteractionEvent, callback);
callback->Delete();
_boxWidgetS1->EnabledOn();
_boxWidgetS1->GetSelectedFaceProperty()->SetOpacity(0.0);