From mboxrd@z Thu Jan  1 00:00:00 1970
From: Adam Porter <adam@alphapapa.net>
Subject: Re: Screenshot of agenda: agenda is not shown in time
Date: Wed, 13 Apr 2016 23:42:40 +0000 (UTC)
Message-ID: <loom.20160414T013932-866@post.gmane.org>
References: <2016-04-13T22-34-23@devnull.Karl-Voit.at>
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Hi Karl,

This seems strange to me too.  I tested your code and found that the
screenshot always showed the pre-agenda state of the frame, showing the lisp
window at the top and the helm-M-x window at the bottom, the way it looked
when I hit RET to run the command.

However, I tried stepping through the function with edebug, and then it
worked properly: the screenshot was taken after the agenda displayed, and it
showed the agenda in the screenshot.

I don't know much about Emacs internals, but I'm guessing that something's
preventing the frame from being repainted until the function finishes. 
Maybe you could use a separate function to take the screenshot and call it
with a timer?