code: function () {
              var items = this._subTplData.itemsView.items;
              for (var i = 0; i < items.length; i++) {
                  if (!items[i].value.currentlyDisabled) {
                      return {
                          id : i,
                          value : items[i].value.value
                      };
                  }
              }
          }
docs: Within the list the first selectable item should get focus when first openend and also can close the list
  when the up arrow is pressed. This method will return the id (in order that the items appear) and the value
  corresponding to the first selectable item.
  @return {Object} the id taken from the order that the items appear, and the value of the item.
  @protected