code: protected String getCellClass(HtmlRenderingContext context, int row, int col) {
          if (ArrayUtils.indexOf(_highlightedColumns, col) == -1) {
              return null;
          }
          return "highlighted";
      }
docs: Overrideable method for setting the class of a cell (the <td>element) in
  the table
  
  @param context
  @param row
  @param col
  @return