public function Form()
    {
        $form = new Form(
            $this,
            'SilverStripe\\Forms\\Form',
            new FieldList($root = new TabSet('Root', new Tab('Main'))),
            new FieldList()
        );

        if ($this->getTopLevelController() instanceof LeftAndMain) {
            $form->setTemplate('LeftAndMain_EditForm');
            $form->addExtraClass('cms-content cms-edit-form cms-tabset center');
            $form->setAttribute('data-pjax-fragment', 'CurrentForm Content');

            $root->setTemplate('CMSTabSet');
            $form->Backlink = $this->getBackLink();
        }

        return $form;
    }