public void setTarget(OWLEntity target) {
   currentTarget = target;
   UserId userId = Application.get().getUserId();
   view.setPostNewTopicEnabled(currentTarget != null && !userId.isGuest());
   view.setPostNewTopicHandler(new PostNewTopicHandlerImpl(Optional.fromNullable(currentTarget)));
   reload();
 }
 public void clearTarget() {
   view.removeAllNotes();
   currentTarget = null;
   view.setPostNewTopicEnabled(false);
   view.setPostNewTopicHandler(new PostNewTopicHandlerImpl(Optional.fromNullable(currentTarget)));
 }