private async void Delete(SampleDetailExtend x)
        {
            var answer = await App.Current.MainPage.DisplayAlert("TSHIRT", "El registro " + x.ProductCode + " sera eliminado, Desea Continuar?", "SI", "NO");

            if (answer)
            {
                Debug.WriteLine(@"Delete " + x.ProductCode);

                Details.Remove(x);
            }
        }
        private async void Update()
        {
            var x = new SampleDetailExtend();

            Debug.WriteLine(@"Update " + x.ProductCode);
        }