How can a descendant UserControl intercept events fired by its base class

public event EventHandler OkClick;
protected virtual void OnOkClick(EventArgs e)
{
    if (OkClick != null) OkClick(this, e);
}

OnOkClick(EventArgs.Empty);

protected override void OnOkClick(EventArgs e)
{
    // do some stuff before the event is fired
    base.OnOkClick(e);
    // do some stuff after the event is fired
}