protected void OnQuantityFocusOut() => Process(FormMessage.NewQuantity(TextBoxMessage.LoseFocus));
protected void OnQuantityChange(string s) => Process(FormMessage.NewQuantity(TextBoxMessage.NewTypeText(s)));
protected void OnQuantityFocusOut() => Process(FormMessage.NewQuantity(TextBoxMessage.LoseFocus));
protected void OnQuantityChange(string s) => Process(FormMessage.NewQuantity(TextBoxMessage.NewTypeText(s)));