code: public void renderOrderDidChange (AbstractMedia media)
      {
          if (_tickStamp > 0) {
              log.warning("Egads! Render order changed during a tick.", new Exception());
          }
  
          _media.remove(media);
          _media.insertSorted(media, RENDER_ORDER);
      }
docs: Called by a {@link AbstractMedia} when its render order has changed.