Carbon - FullSize PopUp win blocked

Hi.

In general terms I'm very satisfied with g2 + carbon theme but I'm having a little problem and i can't find the solution.

Whenever I do click in the fullsize button, both IE7 and FF blocks the popup window at least the first click. If I do click again, then the popups loads.

I was doing some research in the forum but found no solution neither any relative comments. But maybe because my lack of skills in English I use the incorrect search keywords.

So I googling a little and found some articles talking about the way of opening popups and get some idea.

Later, I installed Firebug (FF add-on) and it starts showing me what or where the problem is. It seems is about line 175 /themes/carbon/theme.js:

popwin.document.open();

Do any of you have an idea? If there is any post where you talked about this, please tell me.

Thanks.

P.S.: My big sorry for the bad English.