static void Main()
        {
            var container = new IoCContainer();

            var viewModel = container.Resolve<CashRegisterViewModel>();

            var view = new CashRegisterWindow();
            view.DataContext = viewModel;
            view.WindowStartupLocation = WindowStartupLocation.CenterScreen;
            // view.WindowStyle = WindowStyle.None;
            //view.WindowState = WindowState.Maximized;

            var app = new Application();
            app.Run(view);
        }