QF $process() - does callback have to be a string?

Instead of using a string to specify the callback for a function in the same scope as the $form object, $form->process('doSomething'); is there a way to use a method of an object from an included class? Like, $form->process($object->doSomething); The function I want to use to process the form data is in another class and not in the same scope as the $form object but it seems that the process() method only accepts a string for a parameter. I can always do $form->process('doSomething'); function doSomething($_form_data) { include_once('class.php'); $object = new class(); $object->doSomething($_form_data); } but I was wondering if there was a better way. - Erik Heerlein