static void OnSceneGUI(SceneView view)
        {
            if (!EditorUtility.IsDeveloperMode() ||
                !VertexManipulationTool.showHandleSettingsInScene ||
                view != SceneView.lastActiveSceneView)
            {
                return;
            }

            DoHandleSettings(new Rect(
                                 8,
                                 view.position.height - 40,
                                 400f,
                                 48f));
        }