    contextView = vtkContextView()
    contextView.GetScene().AddItem(placeLegend)

    renderer = contextView.GetRenderer()

    renderWindow = contextView.GetRenderWindow()
--
    view = vtkContextView()
    view.GetRenderer().SetBackground(colors.GetColor3d('SlateGray'))
    view.GetRenderWindow().SetSize(400, 300)

    chart = vtkChartXY()
    view.GetScene().AddItem(chart)
--
    view = vtkContextView()
    view.GetRenderer().SetBackground(colors.GetColor3d("Silver"))
    view.GetRenderWindow().SetSize(640, 480)
    view.GetScene().AddItem(chart)

    # Create a surface
