ateHost = this.__dataHost.__dataHost;
          if (templateHost) {
            templateHost._addEventListenerToNode(node, eventName, handler);
          }
        }
      }
      /**
       * Shows or hides the template instance top level child elements. For
       * text nodes, `textContent` is removed while "hidden" and replaced when
       * "shown."
       * @param {boolean} hide Set to true to hide the children;
       * set to false to show them.
       * @protected
       */
      _showHideChildren(