Xamarin Facebook iOS SDK how to handle success login?

Hi

I'm using the Xamarin Facebook iOS SDK Component...

When I log in I'm asking for permissions and getting the token...
But I would like to do somethings after the user successfully login.
How can I do that?

Here is my code:

Facebook.LoginKit.LoginManager log = new XamarinFacebook.LoginKit.LoginManager ();
    await  log.LogInWithPublishPermissionsAsync (null);

Now after getting the token I want to handle the result.
But I didn't found anything like

log.Completed

Or any Event Handler

Any help?