@Override
        public void actionPerformed(ActionEvent e) {
            if (e.getSource() == addbtn) {
                AddProduct s = new AddProduct("เพิ่มสินค้า");
            }
            if (e.getSource() == salebtn) {
                ProductSale s = new ProductSale("ขายสินค้า");
            }
            if (e.getSource() == closebtn) {
                System.exit(0);
            }
        }