private async void OnImageTapped(Object sender, EventArgs e){
			var imagePreview =  new ProductImageFullScreen ( (sender as Image).Source);

			await Navigation.PushModalAsync( new NavigationPage( imagePreview ) );
		}
        private async void OnImageTapped(Object sender, EventArgs e)
        {
            var imagePreview = new ProductImageFullScreen((sender as Image).Source);

            await Navigation.PushModalAsync(new NavigationPage( imagePreview ));
        }