public static void OpenWindow()
        {
            if (ms_Instance == null)
            {
                var inst = ms_Instance = (MeshPivotFixerEditorWindow)GetWindow(typeof(MeshPivotFixerEditorWindow));
                EditorApplication.playmodeStateChanged += inst.OnPlayModeChanged;

                inst.minSize = new Vector2(200, 200);
                inst.Show();
            }
        }
 void OnDestroy()
 {
     _EnsureStopEditing();
     ms_Instance = null;
 }