public StartPage() : base("CashRegister", breadcrumbHeader: true) { // create data directory FileData.CreateDataDirectory(); // Add page in the program AddPage(new MainMenu(this)); AddPage(new GoodAdd(this)); AddPage(new GoodList(this)); AddPage(new GoodLoad(this)); AddPage(new GoodMenuPage(this)); AddPage(new GoodSave(this)); AddPage(new ShoppingCartPage(this)); AddPage(new ShoppingRegister(this)); // set the main page SetPage <MainMenu>(); }