public override void compontChanged(Component c)
 {
     if (c == button)
     {
         Console.WriteLine("Click Button");
         list.update();
         textBox.update();
     }
     else if (c == list)
     {
         Console.WriteLine("Choose person");
         list.select();
         textBox.setText();
     }
 }
 public abstract void compontChanged(Component c);