Show a popwin-ned buffer from first lines

[arichiardi]

A premise: I am using Emacs Live and therefore I am not well aware of their configuration of popwin.
When I receive an Exception, which in my particular case is displayed in Messages, I see the last, say, 10 lines, that are not usually useful in order to identify the problem.

My question is: is there a way to show the beginning of the buffer and not the end for some popwin buffer? Some popwin:special-display-config flag that I might have missed maybe?

Thank you and thank you for your wonderful addition to emacs!