code: function (id) {
              var carousel = this,
                  n = carousel.get("numItems"),
                  i = 0,
                  items = carousel._itemsTable.items,
                  item;
  
              while (i < n) {
                  item = items[i] || {};
                  if(item.id == id) {
                      return i;
                  }
                  i++;
              }
  
              return -1;
          }
docs: Return the position of the Carousel item that has the id "id", or -1
  if the id is not found.
  
  @method getItemPositionById
  @param index {Number} The index of the item to be returned
  @public