code: function () {
  		this.stop();
  		this.listenTo(this.items, EVENT_ADD, this.triggerAdd);
  		this.listenTo(this.items, EVENT_REMOVE, this.triggerRemove);
  		this.listenTo(this.items, EVENT_SORT, this.triggerSort);
  		this.listenTo(this.items, EVENT_ADD, this.updateLength);
  		this.listenTo(this.items, EVENT_REMOVE, this.updateLength);
  		this.listenTo(this.items, EVENT_ADD, this.watchItem);
  		this.listenTo(this.items, EVENT_REMOVE, this.unwatchItem);
  	}
docs: Begin listening to changes on the internal items storage array