code: function MenuItemSprite (opts) {
      MenuItemSprite.superclass.constructor.call(this, opts)
  
      var normalImage   = opts.normalImage,
          selectedImage = opts.selectedImage,
          disabledImage = opts.disabledImage
  
      this.normalImage = normalImage
      this.selectedImage = selectedImage
      this.disabledImage = disabledImage
  
      this.contentSize = normalImage.contentSize
  }
docs: @class
  A menu item that accepts any cocos.nodes.Node
  
  @memberOf cocos.nodes
  @extends cocos.nodes.MenuItem
  
  @opt {cocos.nodes.Node} normalImage Main Node to draw
  @opt {cocos.nodes.Node} selectedImage Node to draw when menu item is selected
  @opt {cocos.nodes.Node} disabledImage Node to draw when menu item is disabled