<fr:buttons> is removed after saving in form builder

> Hi,
>
> I tried the multi-page form according to the
> http://wiki.orbeon.com/forms/how-to/fb-fr/form-builder-wizard wiki  .  In
> form builder,  after pasting the example code , saving and publishing,  the
> "Next" button doesn't show in form runner.  Then I re-open the form, found
> that the piece of code  <fr:buttons> disappeared.  I'm using Orbeon Form
> 4.0CE M8.
>
> Does the grammar changed?
>
>
>
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