Seperated out the SubSection logic from the form into its own class with in the AisisCore, AisisCore_Form_Form and AisisCore_Form_Elements will extend this to allow for elements to have sub sections and for forms to have one sub section. If you extend Aisis_Form_Form and wish to make changes to or over ride the functions in AisisCore_Form_SubSection you must do that in the class that extends the AisisCore_Form_Form. PHP does not allow for multipl extensions. This is not in the AisisCore Development branch due to not being fullu implemented or documented yet.