Removing custom meta box added in parent theme

Question

I am using a child theme, and wish to change one of the meta boxes defined in the parent theme. The meta box is for 'pages' only. I tried using the remove_meta_box in my functions.php, but it has no effect:

function remove_parents_box() {
    remove_meta_box( 'id-of-meta-box' , 'page' , 'normal' ); 
}
add_action( 'admin_menu' , 'remove_parents_box' );

Any ideas?

Addition to question: I found that the parent theme uses:

add_action( 'admin_menu', 'lala_create_meta_box_page' );
add_action( 'save_post', 'lala_save_meta_data_page' );

To initiate this meta box. As I wish to create the meta-box with my own code, should I actually remove it by something like:

remove_action( 'admin_menu', 'lala_create_meta_box_page',999 );

And then create my own meta-box?

Answer 1

Note: This is the merged version between my and @toscho answers.

Explanation (by @toscho)

Use add_meta_boxes_page as action hook.

You can find the hook in wp-admin/edit-form-advanced.php and it displays as:

do_action('add_meta_boxes_' . $post_type, $post);

Solution(s)

Try the following action, which is inside register_post_type() as well.

function wpse59607_remove_meta_box( $callback )
{
    remove_meta_box( 'id-of-meta-box' , 'page' , 'normal' );
}
add_action( 'add_meta_boxes_page', 'wpse59607_remove_meta_box', 999 );

If you know the exact position where the action, that adds the meta box is registered, you can also just remove this one.

function wpse59607_remove_meta_box()
{
    remove_action( 'admin_menu', 'lala_create_meta_box_page' );
}
add_action( '_admin_menu', 'wpse59607_remove_meta_box', 999 );