code: public void addDetailLine(String lineHtml) {
  
          lineHtml = lineHtml.isEmpty() ? HTML_SPACE : lineHtml;
  
          m_details.setValue(m_details.getValue() + DIV_HTML + lineHtml + DIV_END);
      }
docs: Adds a line to the details label.<p>
  
  @param lineHtml the line to be added