Preselect user_login in pro_login_widget

Dear wonderful s2member-team,
I would like the s2member_pro_login_widget to be preselctet with a username.
I pass the user_login from s2Member-Pro-PayPal-Form registration with this code:

success="/registrierung-erfolgreich?user_login=%%user_login%%"

How do I get the user_login in the pro_login_widget form?

<?php $options = array(
		"signup_url" => "",
		"login_redirect" => "",
		"title" => "Bitte anmelden!"
	);
echo s2member_pro_login_widget ($options, $args); ?> 

It’s probably better if you [hilite mono]"login_redirect" => "/registrierung-erfolgreich",[/hilite] and then on that page pick up the user’s username with a WP function or s2Member’s [hilite mono]S2MEMBER_CURRENT_USER_LOGIN[/hilite] constant.

I hope that helps. :)