docs: function () {
              var url = this.getUrl();
              var pageId = this._cache[url] ? this._cache[url].id : null;
              if (pageId && this._navigate) {
                  this._poppedState = true;
                  this.$callback(this._navigate, {
                      pageId : pageId,
                      url : url,
                      title : this.getTitle()
                  });
              }
          }