          if (newIndex === index) {
            break;
          }
        } while (items[newIndex].disabled);
        return newIndex;
      },
      selectNext: function() {
        var node = this.selectIndex(this.nextIndex(this.selectedIndex));
        node.focus();
      },
      selectPrevious: function() {
        var node = this.selectIndex(this.previousIndex(this.selectedIndex));
        node.focus();
      },
      selectedAttribute: 'checked',
      activateEvent: 'change'
      
    });
  
  </s