@Override
 public void expandRow(final String rowPosition) {
   ViewNavigator nav = getNewNavigator();
   nav.gotoPos(rowPosition, '.');
   ViewEntry current = nav.getCurrent();
   int noteId = new BigInteger(current.getNoteID(), 16).intValue();
   collapsedIds_.remove(noteId);
   expandedIds_.add(noteId);
   clearCache();
 }