private void PrepareProducts()
        {
            _finishGood1 = new Product { ProductType = ProductType.FinishGood, Name = "F1", DrawingNumber = "6606" };
            _finishGood2 = new Product { ProductType = ProductType.FinishGood, Name = "F2", DrawingNumber = "9393" };
            _rawMaterial1 = new Product { ProductType = ProductType.RawMaterial, Name = "R1" };
            _rawMaterial2 = new Product { ProductType = ProductType.RawMaterial, Name = "R2" };

            _finishGood1.SetIdTo(1);
            _finishGood2.SetIdTo(2);
            _rawMaterial1.SetIdTo(3);
            _rawMaterial2.SetIdTo(4);
        }