code: function () {
  
              var oIFrame = this.iframe,
                  oParentNode;
  
              if (oIFrame) {
                  oParentNode = this.element.parentNode;
  
                  if (oParentNode != oIFrame.parentNode) {
                      this._addToParent(oParentNode, oIFrame);
                  }
                  oIFrame.style.display = "block";
              }
          }
docs: Shows the iframe shim, if it has been enabled.
  @method showIframe