private void AddDebtButtonPressedCommandHandler()
 {
     DebtorToModify.Debts.Add(CurrentDebt);
     CurrentDebt = new Debt();
 }
 public AddDebtWindowViewModel(ref Debtor debtorToModify, ref AddDebtWindow window)
 {
     CurrentDebt    = new Debt();
     DebtorToModify = debtorToModify;
     _window        = window;
 }