code: function () {
  
              var oIFrame = this.iframe,
                  oElement = this.element,
                  nOffset = Overlay.IFRAME_OFFSET,
                  nDimensionOffset = (nOffset * 2),
                  aXY;
  
              if (oIFrame) {
                  // Size <iframe>
                  oIFrame.style.width = (oElement.offsetWidth + nDimensionOffset + "px");
                  oIFrame.style.height = (oElement.offsetHeight + nDimensionOffset + "px");
  
                  // Position <iframe>
                  aXY = this.cfg.getProperty("xy");
  
                  if (!Lang.isArray(aXY) || (isNaN(aXY[0]) || isNaN(aXY[1]))) {
                      this.syncPosition();
                      aXY = this.cfg.getProperty("xy");
                  }
                  Dom.setXY(oIFrame, [(aXY[0] - nOffset), (aXY[1] - nOffset)]);
              }
          }
docs: Syncronizes the size and position of iframe shim to that of its
  corresponding Overlay instance.
  @method syncIframe