fr:alert-dialog xxforms:modal="true"

Hi,

  I would like to have the little spinning account show up when i click the positive button of an fr:alert-dialog . Basically have the button from the fr:alert-dialog behave like an xforms:trigger/xforms:submit with the xxforms-modal="true" attribute?
Is this possible? I tried applying it like this but no luck....

<fr:positive-choice xxforms:modal="true">

Thanks!