add_submenu_page isn't working

Hi,

I’m making a custom menu page for a plugin, since the plugin has an own concept for my client.

Now, I’ve created a top level called MP3 Music Player and under there I’ll need 2 sub menu’s, overview and administer (can change in the futur).

Now I’ve this for creating the top level:

add_menu_page('Flash MP3 Music Player', 'MP3 Music Player', 'manage_options', 'fl_player_overview.php', 'fl_player_overview');

And I’ve got this for the submenu’s:

add_submenu_page('Flash MP3 Music Player', 'MP3 Music Player Overview', 'MP3 Overview', 'manage_options', 'fl_player_overview.php', 'fl_player_overview');
		add_submenu_page('Flash MP3 Music Player', 'MP3 Music Player Overview', 'Add new MP3', 'manage_options', 'fl_player_admin.php');

Here’s the entire code:

function fl_player_overview(){
		if (!current_user_can('manage_options')) {
		wp_die( __('You do not have sufficient permissions to access this page.') );
		}

		require('fl_player_overview.php');

	}

	function fl_player_admin_actions(){
		add_menu_page('Flash MP3 Music Player', 'MP3 Music Player', 'manage_options', 'fl_player_overview.php', 'fl_player_overview');
		add_submenu_page('Flash MP3 Music Player', 'MP3 Music Player Overview', 'MP3 Overview', 'manage_options', 'fl_player_overview.php', 'fl_player_overview');
		add_submenu_page('Flash MP3 Music Player', 'MP3 Music Player Overview', 'Add new MP3', 'manage_options', 'fl_player_admin.php');
	}

	add_action('admin_menu', 'fl_player_admin_actions');

The good part is is that he find’s the fl_player_overview page but I don’t get the sublevel menu.

What am I doing wrong here?

Thanks! ??