code: public void addDelegate (PlaceManagerDelegate delegate)
      {
          if (_delegates == null) {
              _delegates = Lists.newArrayList();
          }
          if (_omgr != null) {
              delegate.init(this, _omgr, _invmgr);
              delegate.didInit(_config);
          }
          _delegates.add(delegate);
      }
docs: Adds the supplied delegate to the list for this manager.