static void OnSceneGUI(SceneView sceneView)
        {
            GridOnSceneGUI(sceneView);
            CSGOutlineRenderer.Instance.OnSceneGUI(sceneView);
            var dragArea = CSGSceneBottomGUI.OnSceneGUI(sceneView);

            CSGEditModeGUI.OnSceneGUI(sceneView, dragArea);

            CSGDragAndDropManager.Instance.OnSceneGUI(sceneView);
            CSGClickSelectionManager.Instance.OnSceneGUI(sceneView);
            KeyboardManager.OnSceneGUI(sceneView);
        }