Binding bug??

binding_bug.js

MO.SelectableListItemView = SC.View.extend(
  /** @scope MO.SelectableListItemView.prototype */{

  /**                                                                                        
    @type SC.Hash                                                                            
    @default { bottom: 1 }                                                                   
    @see SC.View#border                                                                      
   */
  border: { bottom: 1 },

  /**                                                                                        
    @type Array                                                                              
    @default ['item', 'checkbox']                                                            
    @see SC.View#childViews                                                                  
   */
  childViews: ['item', 'checkbox'],

  /**                                                                                        
    Initially, the item is unselected.                                                       
    @type Boolean                                                                            
    @default NO                                                                              
   */
  isSelectedBinding: '.checkbox*isSelected',

  checkbox: SC.CheckboxView.design({
    layout: { left: 0, top: 0, right: 0, bottom: 0 }
  }),

  /** @private                                                                               
    Reverse proxy the `isSelected` to the `parentView`'s selection set.                      
   */
  _morcli_isSelectedDidChange: function () {
    if (this.get('isSelected')) {
      this.get('parentView').select(this.get('contentIndex'));
    } else {
      this.get('parentView').deselect(this.get('contentIndex'));
    }
  }.observes('isSelected')

});