Homepage.php

<?php
class HomePage extends Page {

	public static $db = array(
	);

	public static $has_one = array(
	);

	public static $has_many = array(
	'HomeBanners' => 'HomeBanners',
	);

	function getCMSFields() {
		$fields = parent::getCMSFields();

		 //Banners
		$bannerTable = new DataObjectManager(
            $this,
            'HomeBanners',
            'HomeBanners',
            array(
                'Description' => 'Description',
				'Thumbnail' => 'Image'
            ),
            'getCMSFields_forPopup'
        );
        $bannerTable->setAddTitle('Banner');
        $fields->addFieldToTab('Root.Content.Banners', $bannerTable);

          return $fields;
        }

}
class HomePage_Controller extends Page_Controller {

	/**
	 * An array of actions that can be accessed via a request. Each array element should be an action name, and the
	 * permissions or conditions required to allow the user to access it.
	 *
	 * <code>
	 * array (
	 *     'action', // anyone can access this action
	 *     'action' => true, // same as above
	 *     'action' => 'ADMIN', // you must have ADMIN permissions to access this action
	 *     'action' => '->checkAction' // you can only access this action if $this->checkAction() returns true
	 * );
	 * </code>
	 *
	 * @var array
	 */
	public static $allowed_actions = array (
	);

	public function init() {
		parent::init();

		// Note: you should use SS template require tags inside your templates
		// instead of putting Requirements calls here.  However these are
		// included so that our older themes still work
		Requirements::themedCSS('layout');
		Requirements::themedCSS('typography');
		Requirements::themedCSS('form');
	}
}