docs: function ExpandableListView(options) {
                  var _this = _super.call(this, options) || this;
                  _this._statusMgr = null;
                  _this._expandManager = null;
                  _this._statusMgr = new UI.StatusManager();
                  _this._expandManager = new UI.ExpandManager(_this);
                  return _this;
              }