Here’s my modified code for those interested (Note the addition of ‘variables.next = “http://www.facebook.com/connect/login_success.html”‘):

protected function onLogin(p_event:FacebookEvent):void {
p_event.target.removeEventListener(FacebookEvent.COMPLETE, onLogin);

if (p_event.success) {
_auth_token = (p_event.data as StringResultData).value;

//now that we have an auth_token we need the user to login with it
var request:URLRequest = new URLRequest(login_url);
var variables:URLVariables = new URLVariables();

variables.req_perms = ‘publish_stream’;
variables.api_key = api_key;
variables.v = api_version;
variables.auth_token = _auth_token;
variables.fbconnect = “true”;
variables.connect_display = “page”;
variables.next = “http://www.facebook.com/connect/login_success.html”
request.data = variables;
navigateToURL(request, “_blank”);

_waiting_for_login = true;
dispatchEvent(new FacebookEvent(FacebookEvent.WAITING_FOR_LOGIN));
} else {
onConnectionError(p_event.error);
}
}

Thanks
Matt