[assembly: Dependency(typeof(VCService))]
namespace YOUR_NAMESPACE
{
    public class VCService : IVCService
    {
        public void RemoveEmptyViewController(int count)
        {
            try {
                var masterDetailPageRenderer = UIApplication.SharedApplication.KeyWindow.RootViewController.ChildViewControllers.First() as PhoneMasterDetailRenderer;
                var masterDetailPage = masterDetailPageRenderer.Element as MasterDetailPage;

                var navPage = Platform.GetRenderer(masterDetailPage.Detail) as UINavigationController;

                if (navPage.ViewControllers.Count() > count) {
                    int vcIndex = navPage.ViewControllers.Count() - 2;
                    navPage.PopToViewController(navPage.ViewControllers[vcIndex], false);
                }
            } catch {
                // nothing to do
            }
        }
    }
}