Convergent Trading

Using the formElements callback works for adding fields to forms, how do i add the other form elements such as a a new tab, new headers or messages? eg in v4 I would do this.. $form->addTab('My Custom Tab'); $form->addHeader( 'a_language_string' ); $form->addMessage( 'a_language_string', 'ipsMessage ipsMessage_warning' );I can't find a way to do the equivalent in v5, i can add a plain html string as the element but that cannot be placed in a specific location in the form using setPosition() (because that's only available on FormAbstract objects). @Esther E. @Daniel F