public DealWindow(ViewDeal deal)
        {
            InitializeComponent();

            viewDeal = deal;

            using (var data = new DataServiceClient())
            {
                ComboBox_Seller.ItemsSource = data.GetUsersId();
                ComboBox_Buyer.ItemsSource = ComboBox_Seller.ItemsSource;
            }

            ComboBox_Buyer.IsEnabled = false;
            ComboBox_ObjOfTransact.IsEnabled = false;
            ComboBox_KindOfCalc.IsEnabled = false;
            TextBox_PersonalNumberOfDeal.IsEnabled = false;
            TextBox_DateOfDeal.IsEnabled = false;
            TextBox_TransactionAmount.IsEnabled = false;

            SetInfo();

            if (deal.DealID > 0)
            {
                Button_Correct.IsEnabled = true;
                Button_Add.IsEnabled = false;
            }
            else
            {
                Button_Correct.IsEnabled = false;
                Button_Add.IsEnabled = true;
            }
        }