private void Entry_TextChanged(object sender, TextChangedEventArgs e) { vm.NewTender.TenderAmount = vm.NewTender.TrnCollectionLines.Sum(x => x.Amount); vm.NewTender.ChangeAmount = vm.NewTender.TrnCollectionLines.Sum(x => x.Amount) - vm.SelectedSale.TrnSalesLines.Sum(x => x.Amount); vm.RefreshTender(); }