How to Get Autocomplete Support on PopupsAPI

Hey,

I noticed that when creating regular popups (via class="popups-form" or any of the available options) autocomplete fields in node creation pages don't work. But when using your module to add nodes, they work fine (as well as collapsible regions).

So I ask, what is the difference and how did you get them to work? How can I get them to work on manually created popups?

Thanks