silverstripe-blog/code/forms/gridfield/GridFieldConfig_BlogPost.php

<?php

/**
 * GridField config necessary for managing a SiteTree object.
 *
 * @package silverstripe
 * @subpackage blog
 */
class GridFieldConfig_BlogPost extends GridFieldConfig_Lumberjack {
	/**
	 * @param null|int $itemsPerPage
	 */
	public function __construct($itemsPerPage = null) {
		parent::__construct($itemsPerPage);

		$this->removeComponentsByType('GridFieldSiteTreeState');
		$this->addComponent(new GridFieldBlogPostState());
	}
}