自定义帖子类型未显示父级下拉菜单

我正在尝试创建一个自定义的帖子类型，可以与父帖子关联（它们是帖子而不是页面）。Wordpress是3.0.1版。我希望在页面属性下的父帖子下拉列表中看到帖子列表，但我得到的只是一个“顺序”字段。我是否错过了一些重要的事情？

register_post_type( \'mytest_post_type\',
    array(
        \'labels\' => array(
                \'name\' => __( \'mytest Interviews\' ),
                \'singular_name\' => __( \'mytest Interview\' ),
                \'add_new\' => __( \'Add New\' ),
                \'add_new_item\' => __( \'Add New mytest Interview\' ),
                \'edit\' => __( \'Edit\' ),
                \'edit_item\' => __( \'Edit mytest Interview\' ),
                \'new_item\' => __( \'New mytest Int.\' ),
                \'view\' => __( \'View mytest Inteview\' ),
                \'view_item\' => __( \'View mytest Int.\' ),
                \'search_items\' => __( \'Search mytest Interviews\' ),
                \'not_found\' => __( \'No mytest Interviews found\' ),
                \'not_found_in_trash\' => __( \'No mytest Interviews found in Trash\' ),
                \'parent\' => __( \'Parent mytest Interview\' ),

        ),
        \'public\' => true,
        \'show_ui\' => true,
        \'hierarchical\' => true,
        \'query_var\' => true,
        \'supports\' => array(\'title\', \'editor\', \'author\',\'custom-fields\',\'page-attributes\'),

    )
);

或者，是否不可能创建新的自定义帖子类型，并将这些新帖子作为现有帖子的子帖子？

谢谢

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