docs: public void printHtmlHeading(PrintWriter out)
      {
          if (this.getScreenField().getConverter() == null)
              return;
          String strField = this.getScreenField().getConverter().getFieldDesc();
          if ((strField == null) || (strField.length() == 0))
              strField = "&nbsp;";    //?"<br>";
          out.println("<th>" + strField + "</th>");
      }