private void buttonSave_Click(object sender, RoutedEventArgs e)
{
Meal meal = new Meal();
meal.Name = textName.Text;
meal.Favourite = Favourite;
meal.Notes = Notes;
int id = MealRepository.AddMeal(meal);
NavigationService.Navigate(new System.Uri(String.Format("/MealPage.xaml?selectedItem={0}", id), UriKind.Relative));
}