public override string GetDesignTimeHtml()
    {
      StringWriter sw = new StringWriter();
      HtmlTextWriter tw = new HtmlTextWriter(sw);
      ShowHidePanel ct = (ShowHidePanel)Component;

      tw.RenderBeginTag( HtmlTextWriterTag.Table);

      // Create first row
      tw.RenderBeginTag( HtmlTextWriterTag.Tr);
      tw.AddAttribute(HtmlTextWriterAttribute.Height, "25");
      tw.AddAttribute(HtmlTextWriterAttribute.Bgcolor, "LightSteelBlue");
      tw.RenderBeginTag( HtmlTextWriterTag.Td);
      ct.TopPanel.RenderControl(tw);
      tw.RenderEndTag();
      tw.RenderEndTag();

      // Create second row
      tw.RenderBeginTag( HtmlTextWriterTag.Tr);
      tw.RenderBeginTag( HtmlTextWriterTag.Td);
      ct.BottomPanel.RenderControl(tw);
      tw.RenderEndTag();
      tw.RenderEndTag();

      // Close table
      tw.RenderEndTag();
      
      return sw.ToString();
    }