// mSlicers[i]->GetRenderWindow()->GetInteractor()->
// GetInteractorStyle()->AddObserver(vtkCommand::LeftButtonReleaseEvent, smc);
mSlicers[i]->GetRenderWindow()->GetInteractor()->
// mSlicers[i]->GetRenderWindow()->GetInteractor()->
// GetInteractorStyle()->AddObserver(vtkCommand::LeftButtonReleaseEvent, smc);
mSlicers[i]->GetRenderWindow()->GetInteractor()->