Mattao, you may want to email this question to the
support ninjas. We spend as much time on the forums as we're able to on top of our other duties, but given that we released a new version of OmniPlan this week and Lion also came out, we haven't had as much time as usual.
In this case, I saw it, but my OmniGraffle-fu isn't as strong as other folks; if you email the ninjas, you're going to get a response from someone more knowledgeable than I...