如何在页面属性上显示帖子类型？例如，我有一个自定义的帖子类型product, 我想要show it页面属性alongside 现有WP岗位类型：page, post.

所以我想要所以有一个dropdown options 用户可以switch around 这些职位类型：

post
page
product

function product_init() {
    $args = array(
        \'labels\' => array(
            \'name\' => __(\'Products\'),
            \'singular_name\' => __(\'Product\'),
            \'all_items\' => \'All Products\'
        ),
        \'public\' => true,
        \'show_ui\' => true,
        \'capability_type\' => \'page\',
        \'hierarchical\' => true,
        // \'rewrite\' => array(\'slug\' => \'Products\'),
        \'query_var\' => true,
        \'menu_icon\' => \'dashicons-star-filled\',
        \'supports\' => array(
            \'title\',
            \'editor\',
            // \'excerpt\',
            // \'trackbacks\',
            //\'custom-fields\',
            //\'comments\',
            \'revisions\',
            \'thumbnail\',
            \'author\',
            \'page-attributes\',
            )
        );
    register_post_type( \'product\', $args );
}
add_action( \'init\', \'product_init\' );