return windowFocusOwner;
return null;
  public Component getFocusOwner ()  {    KeyboardFocusManager manager = KeyboardFocusManager.getCurrentKeyboardFocusManager ();    Window activeWindow = manager.getActiveWindow ();    // The currently-focused Component belongs to the active Window.    if (activeWindow == this)      return manager.getFocusOwner ();    else      return windowFocusOwner;  }