Playing with Auto Actions

Hi Guys
I would like to have my users complete their profile more.
To that effect I've created an autoaction 'After Login' that redirects to their profile, and shows a Warning with some text in it.
I also have a module that shows the progress:
[cb:if cb_progress<"100"]<a href="/personlig/din-profil">[cb:userfield field="cb_progress" /]<br /><b>Du skal huske at angive manglende oplysninger</b></a>[/cb:if]
This shows the progress bar and also the missing fields.
But how do I make the missing fields appear in the autoaction warning message instead?
I've tried jus writing [cb:userfield field="cb_progress" /] in the message, but that didn't work.

The onAfterLogin trigger contains the user object so it should substitute in fields fine. When substituting it in what is it displaying in the redirect message? It may not like the HTML of the progress display. Aside from that there's no way to get the field names of the incomplete fields.