xt item.
     *
     * @method selectNext
     */
    selectNext: function() {
      var index = (Number(this._valueToIndex(this.selected)) + 1) % this.items.length;
      this.selected = this._indexToValue(index);
    },

    /**
     * Selects the item at the given index.
     *
     * @method selectIndex
     */
    selectIndex: function(index) {
      this.select(this._indexToValue(index));
    },

    /**
     * Force a synchronous update of the `items` property.
     *
     * NOTE: Consider listening 