anchor.diff:        selected_students: React.PropTypes.array
       },
       releaseMarks: function() {
  +      document.getElementById('working').style.display = '';
         var dataLoad = {
           release_results: true,
           filter: 'none',
           students: this.props.selected_students
         };
  +
         jQuery.ajax({
           method: 'POST',
           url: 'update_grade_entry_students',
  
positive.code:   React.renderComponent(<GradesTable />, document.getElementById('react_grades_table'));
  
  </script>
  
  
negative.code: 
            if (column_id === 'marking_state'){
              r[column_id] = <img src={row[column_id]}/>;
            }
            else if (column_id === 'total_marks'){
              r[column_id] = <GradeBoxTotal grade_id={'grade_' + row.id + '_' + column.id}
                             grade_entry_column={column.id} student_id={row.id}
                             value={row[column_id]}/>;
            }
            else {
              r[column_id] =
                <GradeEntryBox
  