如何将不可见的ViewModel添加到MvvmCross中的导航堆栈

public class MyViewModel : MvxViewModel
{
    // ...
}

public class MyViewModel : MvxViewModel
{
    private IMvxNavigationService _navigationService;

    public MyViewModel(IMvxNavigationService navigationService)
    {
        _navigationService = navigationService;
    }

    // ...
}

await _navigationService.Navigate<MyViewModel>();