How to use index() with <fr:grid repeat="true" ... in Orbeon 4?

> Hi.
>
> I need to get current index of <fr:grid repeat=&quot;true&quot; (replacement
> &lt;xforms:repeat) in Orbeon 4 M7.
>
> In my form I have:
>
>            &lt;xforms:instance id=&quot;fr-form-instance&quot;>
>                 <form>
>                     <section-1>
>                         <grid-2>
>                             <sb-01/>
>                             <sb-02/>
>                         </grid-2>
>
>                     </section-1>
>                 </form>
>             </xforms:instance>
> ...
>                     <fr:grid min="1" repeat="true" id="grid-2-grid"
> bind="grid-2-bind"
>                              origin="instance('grid-2-template')">
>
> And how I can use index() function to know current index of repeater?
> Something like index('grid-2-grid') don't work.
>
> Can anyone help me?
>
>
>
>
>
>
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