If I save the preview as a html file, and run on the browser directly, it works fine.
Stylus Studio prevents the IE5 window displayed in the preview scenario
from switching to a document different from the previewed one. And that's
what you are really trying to do, switching to a different document than
the previewed one...
If we allowed you to do that, we would loose the ability to process
back-mapping information in the main document, and we would have to expose
some kind of navigation stack to let you understand what you are actually
I'm adding this to our PCR list, but I don't think this is something we
will address anytime soon.