docs: function (event) {
              var pageId = event.pageId;
              if (this.currentPageId == pageId) {
                  this._rootModule.unloadPageModules(pageId);
                  this.navigate({
                      pageId : pageId,
                      url : this._navigationManager ? this._navigationManager.getUrl() : null,
                      forceReload : true
                  });
              }
          }