docs: function (item) {
              var key = this._getKeyForItem(item),
                  list = this.$renderedItems;
              if (key) {
                  list = this.$renderedItemsMap[key];
              }
              if (list) {
                  var ri;
                  for (var i = 0; i < list.length; i++) {
                      ri = list[i];
                      if (key || ri.item === item) {
                          return ri.component;
                      }
                  }
              }
              return null;
          }