How can I show only terms from a certain vocabulary in a view summary? I have a View that has a contextual filter for Taxonomy terms... I have selected that if the parameter is not given just show a summary, but I want that summary to show only terms of a certain vocabulary... is that possible?

UPDATE: Just to be clear. I'm selecting nodes that has two fields that points to different vocabularies, so in the summary the view is showing all the terms form both vocabularies, I just want to show the terms that are only on one of them.
I was looking for the same thing. I found my answer here: http://drupal.org/node/1243488#comment-4843640

It's not very intuitive, but it works.