}//call the add tester window
private void add_trainee(object sender, RoutedEventArgs e)
{
addTrainee addtrainee = new addTrainee();
addtrainee.ShowDialog();
trainees_list.Items.Refresh();
}//call the add trainee window
private void MenuItem_Click_2(object sender, RoutedEventArgs e)
{
addTrainee addtrainee = new addTrainee();
addtrainee.Show();
this.Close();
}