function plt_hide_wpmbytplayer_menus() {
//Hide the "mb.ideas" menu.
remove_menu_page('mb-ideas-menu');
//Hide the "mb.ideas → All plug-ins" menu.
remove_submenu_page('mb-ideas-menu', 'mb-ideas-menu');
//Hide the "mb.ideas → YTPlayer" menu.
remove_submenu_page('mb-ideas-menu', 'wpmbytplayer/mbYTPlayer.php');
}
add_action('admin_menu', 'plt_hide_wpmbytplayer_menus', 11);