I had some trouble with this rather complicated COM structure called ACTRL_ACCESS. So I post a diagram to show its design. Otherwise it would be a pity to leave it on my private hard drive.

I found this question in the borland mailinglist:
… I get my dialog and all runs well – *except* I’ve lost theming
on this particular dialog. This means the application’s main windows shows
up correctly themed, the progress dialog does not. I’ve already added the
XP manifest to the progress dialog, too, but to no avail so far.
A theme [...]