Automatic Regenerate of simulation model in SOPC builder

Do anyone how to start automatic regenerate of simulation model from SOPC builder after I have changed the parameter value in SOPC?

I saw a generation callback in SOPC document? I am not that clear about this function? Do anyone know how to use it? it will be good if you can provide a very simple design to show this.....

Appreciate if you could response me asap....