wordpress - Remove custom header subpage with remove_submenu_page -

how can remove header , background subpages appearance submenu?

remove_submenu_page works great themes , menus, can't seem find way remove header , background!

here's example:

   // working fine:    remove_submenu_page( 'themes.php', 'themes.php' );    remove_submenu_page( 'themes.php', 'nav-menus.php' );     // not working:    remove_submenu_page( 'themes.php', 'themes.php?page=custom-header' );     remove_submenu_page( 'themes.php', 'themes.php?page=custom-background' );  

use following code in theme's function.php

add_action( 'after_setup_theme','remove_twentyeleven_options', 100 ); function remove_twentyeleven_options() {  remove_custom_background(); remove_custom_image_header();  }