public function get_additem_form()
{
/** @var FormUI $additem_form */
$additem_form = FormUI::create('dash_additem')->set_properties(array('onsubmit' => 'dashboard.add(); return false;'));
$additem_form->append(FormControlSelect::create('module')->set_options(Plugins::filter('dashboard_block_list', array())));
$additem_form->append(FormControlSubmit::create('submit')->set_caption(_t('+')));
$this->theme->additem_form = $additem_form->get();
}