protected function getToplevelController()
    {
        $c = $this->owner->getController();
        while ($c && $c instanceof GridFieldDetailForm_ItemRequest) {
            $c = $c->getController();
        }
        return $c;
    }
protected function getToplevelController()
    {
        $c = $this->owner->getController();
        while ($c && $c instanceof GridFieldDetailForm_ItemRequest) {
            $c = $c->getController();
        }
        return $c;
    }
protected function getToplevelController ( ) { $ c = $ this -> owner -> getController ( ) ; while ( $ c && $ c instanceof GridFieldDetailForm_ItemRequest ) { $ c = $ c -> getController ( ) ; } return $ c ; }
Gets the top level controller.

@return Controller
@todo  This had to be directly copied from {@link GridFieldDetailForm_ItemRequest}
because it is a protected method and not visible to a decorator!
Gets the top level controller .