private void ClosePaymentScreen()
{
var paidItems = MergedItems.SelectMany(x => x.PaidItems);
SelectedTicket.UpdatePaidItems(paidItems);
AppServices.MainDataContext.SelectedTicket.PublishEvent(EventTopicNames.PaymentSubmitted);
TenderedAmount = "";
ReturningAmount = "";
ReturningAmountVisibility = Visibility.Collapsed;
SelectedTicket = null;
}