protected function getHtmlBody(): string
  {
    $ret = '';
    $i   = 0;
    foreach ($this->controls as $control)
    {
      if ($control!==$this->footerControl)
      {
        $control->addClass(OverviewTable::$class);
        $control->addClass(($i % 2==0) ? 'even' : 'odd');

        $ret .= $control->getHtml();

        $i++;
      }
    }

    return $ret;
  }