code: function FlipView_inserted(itemPromise, previousHandle, nextHandle) {
                              that._itemsManager._itemFromPromise(itemPromise).then(function (element) {
                                  var previous = that._itemsManager._elementFromHandle(previousHandle);
                                  var next = that._itemsManager._elementFromHandle(nextHandle);
                                  that._pageManager.inserted(element, previous, next, true);
                              });
                          }
docs: Callbacks for itemsManager