private void Button_Click(object sender, RoutedEventArgs e)
        {
            SellerWindow.Instance.addProduct.IsEnabled = true;

            ViewProduct newView = new ViewProduct();

            newView.initData(this.shopData.shopId);

            SellerWindow.Instance.addUIElement(SellerWindow.Instance.shopGrid, newView);
            SellerWindow.Instance.bringToFrontShop(newView);
        }
 public ViewProduct()
 {
     Instance = this;
     InitializeComponent();
 }