Facebook Request Dialog API: Request or Invitation

Facebook Requests Dialog seem to generate two kinds of notification messages

1. Janet sent you requests in CityVille.
2. Janet have invited you to CityVille.

How does one specify which one to use. I couldn't find any options in

FB.ui({method: 'apprequests', message: ''});

By default it seems to be generating message of type 1. App permission doesn't seem to effect this.

The legacy fb:request-form http://developers.facebook.com/docs/reference/fbml/request-form had options - 'invite' and 'type' to do exactly that.

How does one do the same thing using the Facebook Request Dialogs today ?

You may find this post useful:
http://developers.facebook.com/blog/post/464/

And for request dialogs:
http://developers.facebook.com/docs/reference/dialogs/requests/

Just to clarify, with the new Facebook 3.0 SDK this is automatic when you send a request to a user who hasn't installed your app yet.

https://developers.facebook.com/docs/guides/games/#invites

You just need to add

app_non_users

To your "filters" parameter

This is not possible with the new API. It used to be possible earlier with the fb:friend:selector with invite=true.