Hello Since one of our guys stumbled upon this detail, the f:ajax is supposed to deliver the javascript for the f:ajax tag to the component involved the question now is. If we have a button which has the behavior applied to, does the behavior render a return false at the end or should it be possible that the button can do a form submit afterwards. My personal guess is either is correct, if the behavior adds a return false at the end, then the ajax call is done and no form submit is done afterwards, if it is not done then subsequent added scripts might not be blocked (by other behaviors or internally set scripts) but the button has to detect that an ajax behavior is applied and has to add the return false at the end himself, so what is the correct approach targetting this. Kind regards Werner Punz