public void SelectRecipient(TransferToAccount account)
 {
     Navigator.UriFor<AmountViewModel>()
              .WithParam(p => p.FromAccountId, FromAccountId)
              .WithParam(p => p.ToAccountId,   account.Id)
              .Navigate();
 }
 bool AlreadyExists(IEnumerable<TransferToAccount> list, TransferToAccount transaction)
 {
     return list.Any(y => y.Equals(transaction));
 }