private void Edit_Click(object Sender, RoutedEventArgs E)
 {
     if (lb.SelectedItem != null)
     {
         EditTravel Edit = new EditTravel(lb.SelectedItem as DB.Reise);
         Edit.Show();
     }
 }
        private void New_Click(object Sender, RoutedEventArgs E)
        {
            EditTravel Edit = new EditTravel();

            Edit.Show();
        }