When should you override OnEvent as opposed to subscribing to the event when inheritting

Question

When should one do the following?

class Foo : Control
{
    protected override void OnClick(EventArgs e)
    {
        // new code here
    }
}

Answer 1

If you override like Kent Boogaart comments you'll need to be carefull to call back base.OnClick to allow event suscriptions to be called