// Select - Return-Mode
private void returnRadioBtn_Checked(object sender, RoutedEventArgs e)
{
userIdTbx.Text = "";
userIdTbx.IsEnabled = false;
borrowReturnBtn.Content = "Return";
_mode = BorrowReturnMode.Return;
}
// Select - Borrow-Mode
private void borrowRadioBtn_Checked(object sender, RoutedEventArgs e)
{
userIdTbx.IsEnabled = true;
borrowReturnBtn.Content = "Borrow";
_mode = BorrowReturnMode.Borrow;
}
