code: protected void clearMedia ()
      {
          if (_tickStamp > 0) {
              log.warning("Egads! Requested to clearMedia() during a tick.", new Exception());
          }
  
          for (int ii = _media.size() - 1; ii >= 0; ii--) {
              _media.remove(ii).shutdown();
          }
      }
docs: Clears all media from the manager and calls {@link AbstractMedia#shutdown} on each. This
  does not invalidate the media's vacated bounds; it is assumed that it will be ok.