public FormShoppingCart()
        {
            InitializeComponent();
            _repo           = new BeverageRepo();
            priceCalculator = new PriceCalculator();
            _cart           = ShoppingCart.GetShoppingCart();

            //foreach (var control in this.Controls)
            //{
            //    MyUserControl myUserControl = control as MyUserControl;
            //    if (myUserControl != null)
            //    {
            //        myUserControl.AddToCartButtonClicked += AddToCartButtonClickedInUserControl;
            //    }
            //}
            var drinks = _repo.GetBeverages();

            ShowShoppingCartItems(drinks);

            ShowTotalExclBTW(drinks);
            ShowBTW(drinks);
            ShowTotalInclBTW(drinks);
        }