protected function configureEdit($fields = null)
    {
        // We are actually in the frame!
        if ($this->isEditing('edit')) {
            $m = $this->form->setModel($this->model, $fields);
            $m->load($this->id);
            $this->form->addSubmit();
            $this->form->onSubmit(array($this, 'formSubmit'));

            return $m;
        } elseif ($this->isEditing()) {
            return;
        }

        $this
            ->virtual_page
            ->addColumn(
                'edit',
                'Editing '.$this->entity_name,
                array('descr' => 'Edit', 'icon' => 'pencil'),
                $this->grid
            );
    }