public ToolSelectionUserControl(
			PencilRendererState pencilRendererState,
			EraserRendererState eraserRendererState)
        {
            pencilRendererState.ThrowIfNull("pencilRendererState");
            eraserRendererState.ThrowIfNull("eraserRendererState");

            _pencilRendererState = pencilRendererState;
            _eraserRendererState = eraserRendererState;

            InitializeComponent();

            toolStripButtonPencil.Image = Resources.Pencil;
            toolStripButtonEraser.Image = Resources.Eraser;

            _pencilUserControl = new PencilUserControl(pencilRendererState)
                                 	{
                                 		Dock = DockStyle.Fill,
                                 		Visible = false
                                 	};
            _eraserUserControl = new EraserUserControl(eraserRendererState)
                                 	{
                                 		Dock = DockStyle.Fill,
                                 		Visible = false
                                 	};

            AddToolUserControls();
            SelectPencil();
        }
        public EraserUserControl(EraserRendererState eraserRendererState)
        {
            eraserRendererState.ThrowIfNull("eraserRendererState");

            _eraserRendererState = eraserRendererState;

            InitializeComponent();
        }