code: public String buttonBarHorizontalLine() {
  
          StringBuffer result = new StringBuffer(256);
          result.append("<table border=\"0\" cellpadding=\"0\" cellspacing=\"0\" class=\"maxwidth\">\n");
          result.append("<tr>\n");
          result.append("\t<td class=\"horseparator\" ><img src=\"");
          result.append(getSkinUri());
          result.append("tree/empty.gif\" border=\"0\" width=\"1\" height=\"1\" alt=\"\"></td>\n");
          result.append("</tr>\n");
          result.append("</table>\n");
          return result.toString();
      }
docs: Generates a horizontal button bar separator line with maximum width.<p>
  
  @return a horizontal button bar separator line