private async void LoadTans()
        {
            if (BatchSummary != null)
            {
                TANs.Clear();
                WorkInProgress = true;
                try
                {
                    var result = await RestHub.TansOfDelivery(BatchSummary.Id, IsZeroRxns, IsQueried);

                    if (result.HttpCode == System.Net.HttpStatusCode.OK)
                    {
                        List <DeliveryTanDTO> dtos = (List <DeliveryTanDTO>)result.UserObject;
                        foreach (var dto in dtos)
                        {
                            TANs.Add(new DeliveryTanVM
                            {
                                Id                    = dto.Id,
                                TanNumber             = dto.TanNumber,
                                RXNCount              = dto.RXNCount,
                                IsQueried             = dto.IsQueried,
                                DeliveryRevertMessage = dto.DeliveryRevertMessage
                            });
                        }
                    }
                    else
                    {
                        AppErrorBox.ShowErrorMessage("Error While Batches . .", result.StatusMessage);
                    }
                }
                catch (Exception ex)
                {
                    AppErrorBox.ShowErrorMessage("Error While Batches . .", ex.ToString());
                }
                finally
                {
                    WorkInProgress = false;
                }
            }
        }