    left_chart_actor = vtkContextActor()

    left_chart_scene.AddItem(left_chart)
    left_chart_actor.SetScene(left_chart_scene)

    left_renderer.AddActor(left_chart_actor)
--
    right_chart_actor = vtkContextActor()

    right_chart_scene.AddItem(right_chart)
    right_chart_actor.SetScene(right_chart_scene)

    right_renderer.AddActor(right_chart_actor)
