code: function (domElt) {
                  this.$Frame.linkToDom.call(this, domElt);
                  this._childRootElt = domUtils.getDomElementChild(domUtils.getDomElementChild(domElt, this._mainContentIndex), 0);
              }
docs: Link this frame to a DOM element after the markup has been inserted in the DOM.
  @param {HTMLElement} domElt The DOM element which corresponds to the first item inserted by the
  writeMarkupBegin method.