QuickForm element group validation

Hello! I have a small problem when trying to validate element groups with my own rules. Everything works fine with the predefined ones, though. I have made a 'fake' validation function that does nothing but return a false bool. I register the rule and then try to use it. It works flawlesly when used with addRule for a single element, but is ignored when used with addGroupRule. What am I doing wrong? /martin