code: public void update(String url, int additionalHeight)
    {
  
      if (iframe.getSrc() != null && url != null && iframe.getSrc().equals(url))
      {
        return;
      }
  
      if (additionalHeight > -1)
      {
        this.additionalHeight = additionalHeight;
      }
  
      final Style style = iframe.getStyle();
  
      style.setWidth(
        100, Style.Unit.PCT);
  
      if (url != null)
      {
        //VConsole.log("iframe is updated with url " + url );
        iframe.setSrc(url);
  
      }
    }
docs: Called whenever an update is received from the server