Doubt in using ActionButton

[Andre Gustavo Lomonaco]

Hi,

Using the Click Examples, I'm trying to put a ActionButton in a Edit Page 
but I cannot make work.. Here my doubt

After the user choose the correct row in the table, the user is redirect to 
the EditRoteadorSNMP Page

http://192.168.80.110:8080/NetworkAdvisor/edit/edit-roteador-snmp.htm?id=200&referrer=%2Ftable%2Froteador-table.htm

You can see the id is equal 200

The form in this page works nice and permit the user edit the row with id = 
200

I add in this same page, one ActionButton, not inside the Form...

My doubt is why I cannot get the id value after the user click this Action 
Button

Here the code

public class EditRoteadorSnmp extends BorderPage {

  private Form form = new Form("form");
  protected ActionButton button = new ActionButton("action");
 @Bindable protected Integer id;
.....

public EditRoteadorSnmp() {

       addControl(form);
       addControl(button);
       button.setListener(this, "onButtonClick");
........

public boolean onButtonClick() {

       System.out.println(id);                ---- why I receive the NULL 
value here ------------------
}

Thanks in Advanced

My Best Regards

Andre Gustavo Lomonaco