Clearing WP back stack in MvvmCross

BaseViewModel.cs

namespace MyApp.Portable.ViewModels
{
    public class BaseViewModel : MvxViewModel
    {
        protected void ShowViewModelAndClearBackStack<TViewModel>()
            where TViewModel : BaseViewModel
        {
            ShowViewModel<TViewModel>();
            ChangePresentation(new ClearNavBackStackHint());
        }
    }
}

ClearNavBackStackHint.cs

namespace MyApp.Portable.PresentationHints
{
    public class ClearNavBackStackHint : MvxPresentationHint
    { }
}

CustomWP8ViewPresenter.cs

namespace MyApp.WP8.Views.ViewPresenters
{
    public class CustomWP8ViewPresenter : MvxPhoneViewPresenter
    {
        public CustomWP8ViewPresenter (PhoneApplicationFrame rootFrame) : base(rootFrame)
        { }

        public override void ChangePresentation(MvxPresentationHint hint)
        {
            if (hint is ClearNavBackStackHint)
            {
                while (RootFrame.BackStack.Any())
                {
                    RootFrame.RemoveBackEntry();
                }
            }

            base.ChangePresentation(hint);
        }
    }
}

Setup.cs

namespace MyApp.WP8
{
    public class Setup : MvxPhoneSetup
    {
        public Setup(PhoneApplicationFrame rootFrame) : base(rootFrame)
        {
        }

        protected override IMvxPhoneViewPresenter CreateViewPresenter(PhoneApplicationFrame rootFrame)
        {
            var presenter = new CustomWP8ViewPresenter(rootFrame);
            Mvx.RegisterSingleton(presenter);
            return presenter;
        }
    }
}