[Zope] side sorting

[Oliver Vecernik]

Hi,

I have following DTML method for a sidebar construction:
<ul>
  <dtml-in expr="objectValues('Folder')" sort="_.[sort]">
    <li><a class="sidemenu" href="&dtml-absolute_url;"><dtml-var
title_or_id></a><br></li>
  </dtml-in>
</ul>

I set a property named 'sort' to every folder, but my code doesn't work.
How can I achieve arbitrary sorting for the menu? 

Oliver