new void OnEnable()
        {
            base.OnEnable();
            var root = rootVisualElement;

            m_MiniMap          = new MiniMap();
            m_MiniMap.windowed = true;
            m_MiniMap.zoomFactorTextChanged += ZoomFactorTextChanged;
            root.Add(m_MiniMap);

            OnGraphViewChanged();
            m_ZoomLabel                      = new Label();
            m_ZoomLabel.style.width          = 35;
            m_ZoomLabel.style.unityTextAlign = TextAnchor.MiddleRight;
            m_ToolbarContainer.Add(m_ZoomLabel);
        }
        new void OnEnable()
        {
            base.OnEnable();
            var root = rootVisualElement;

            m_MiniMap          = new MiniMap();
            m_MiniMap.windowed = true;
            m_MiniMap.zoomFactorTextChanged += ZoomFactorTextChanged;
            root.Add(m_MiniMap);

            OnGraphViewChanged();
            m_ZoomLabel = new Label();
            m_ZoomLabel.style.position = Position.Absolute;
            m_ZoomLabel.style.right    = 4;
            m_ZoomLabel.style.top      = 1;
            m_Toolbar.Add(m_ZoomLabel);
        }