Admin Menus / Sub Menus with Custom Post Types

Hi All

I am creating a plugin which has several custom post types and I want to group them together in one menu.

I have managed to get the menu structure working ok but when I click through to my custom post the menu closes, the custom post is highlighted when u roll over it but I want it to stay open

My Menu Code is:

function add_your_menu() {
	add_menu_page( 'My Menu', 'My Menu Title', 'manage_options', 'my_menu_slug', 'my_admin_page', plugins_url( 'myPlugin/images/myIcon.png'), 6);
	add_submenu_page( 'my_menu_slug', 'First Sub Menu Link', 'First Sub Menu Link Title', 'manage_options', 'edit.php?post_type=first_sub_menu');
}
add_action('admin_menu', 'add_your_menu');

function my_admin_page(){
?>
	<h1>Title</h1>
<?
}

I have looked around but cant find a solution that works, please can someone help?

[Moderator Note: No bumping. If it’s that urgent, consider hiring someone instead.]