login new created user

Hi,

I use rules to automaticaly create a user account when someone create a node on my website, I use the CCK fields email and usernames on this node type to create the account, and then send a mail to the user with the account details, everything is working fine.

But I want to, just after the account is created and mail sent, I want to login the user automatically, so he can add other nodes w/o accessing his mail for the login details.

I tryed "load user account" and then "add user role", but on that window the "Select role(s) : " is invisible, and it's required, so I can't change the role to "autonticated".

How can I make the "Select role(s) : " available ? or there is another way to login the user ?

Thanks .