Cloud.Friends.search order

Hi !

I've a simple question on ACS... :) I use this code to display a user's friends list :

Cloud.Friends.search({
    user_id : Ti.App.CurrentUser,
    per_page : 5,
    page : n
}...

And I would to get a list sorted on "first_name" field of "User" ACS object. I tried using the fields order on my query but it doesn't work and if I make a javascript sort with

function compare(a, b) {
    if (a.first_name < b.first_name)
        return -1;
    if (a.first_name > b.first_name)
        return 1;
    return 0;
}
friends.users.sort(compare);

the problem is that the sort is only done on the pagged list items...

So if someone has an idea... :)

Thank you in advance ! Hervé