function plt_hide_userplus_menus() {
//Hide the "UserPlus" menu.
remove_menu_page('userplus');
//Hide the "UserPlus → UserPlus" menu.
remove_submenu_page('userplus', 'userplus');
//Hide the "UserPlus → Forms" menu.
remove_submenu_page('userplus', 'edit.php?post_type=userplus_form');
}
add_action('admin_menu', 'plt_hide_userplus_menus', 11);