public void ExecuteAddCashTransactionCommand(object parametr)
 {
     DayCosts.Add(new OneCashTransaction()
     {
         Article = NewCashTransaction.Article, Money = NewCashTransaction.Money
     });
     DailyTotalCosts += NewCashTransaction.Money;
     CostsRepository.Instance.AddOperation(NewCashTransaction);
     NewCashTransaction = new OneCashTransaction();
 }