Pressing return in a field and which botton gets "auto-press

[tony.herstell1]

I have these buttons (and will have another soon) and want a given button to be "auto-pressed" when the user logs in.
At the moment I think it picks the nearest button!
Can we somehow add an attribute to the button to tell seam which button to auto-press or canthis be done already and I have just not seen it yet?

<td>
 <h:commandButton type="submit"
 value="#{messages.button_login}"
 action="#{identity.login}">
 </h:commandButton>
</td>
<td>
 <h:commandButton
 action="#{loginController.cancel}"
 value="#{messages.button_cancel}" immediate="true"
 type="submit" />
</td>

[tony.herstell1]

By "auto-pressed" I mean that when the user presses return (say in the password field). ..