private void editUser()
        {
            if (usersCatalog.SelectedItem != null)
            {
                User user = (User) usersCatalog.SelectedItem;

                NewUserWin nuw = new NewUserWin(user);
                nuw.ShowDialog();

                RefreshList();
            }
        }
 private void addUser_Click(object sender, System.Windows.RoutedEventArgs e)
 {
     NewUserWin nuw = new NewUserWin();
     nuw.ShowDialog();
     RefreshList();
 }