Registration function in Theme My Login

Hey all!
Can someone please explain how to add an action (function) after user have registered with using user’s password and email…

I’ve tried to add next things in my theme’s function.php :

add_action('wp_create_user', 'myfunc', 1, 3);
function myfunc($sanitized_user_login, $user_pass, $user_email) {
  ........
}

…but that doesn’t help (