Form.php

<?php
/*------------------------------------------------------------------------
# SM Mega Menu - Version 3.2.0
# Copyright (c) 2015 YouTech Company. All Rights Reserved.
# @license - Copyrighted Commercial Software
# Author: YouTech Company
# Websites: http://www.magentech.com
-------------------------------------------------------------------------*/
namespace Sm\MegaMenu\Block\Adminhtml\MenuGroup\Edit;

class Form extends \Magento\Backend\Block\Widget\Form\Generic
{
	protected function _prepareForm()
	{
		/** @var \Magento\Framework\Data\Form $form */
		$form = $this->_formFactory->create(
			[
				'data' => [
					'id' => 'edit_form',
					'action' => $this->getData('action'), 'method' => 'post'
				]
			]
		);
		$form->setUseContainer(true);
		$this->setForm($form);
		return parent::_prepareForm();
	}
}