Facebook SDK 4.0 LoginButton - setReadPermissions not working?

I have implemented LoginButton from Facebook 4.0 SDK. Input and output are working normally.

Now I want to set permission "user_friends" with LoginButton.setReadPermissions(Arrays.asList("user_friends"));

But it looks like this line of code is being ignored? When I read the permissions after successfully logging in with getAccessToken().getPermissions();

, I only have "basic_info" .

If I use LoginManager.getInstance().logInWithReadPermissions( HighscoreFragment.this, Arrays.asList("user_friends") );

this instead, I get the correct permissions. But I want to use LoginButton .

So what is the correct way to implement the LoginButton and set the required permissions on login?

This is my code:

@Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        View view = inflater.inflate(R.layout.fragment_highscore, container, false);

        mLoginButton = (LoginButton) view.findViewById(R.id.login_button);
        mLoginButton.setReadPermissions(Arrays.asList("user_friends"));
        mLoginButton.setFragment(this);    

        // Callback registration
        mLoginButton.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
            @Override
            public void onSuccess(LoginResult loginResult) {

                Log.i(TAG, "LOGIN SUCCESFUL");
                Log.i(TAG, loginResult.getAccessToken().getPermissions().toString());
                AccessToken accessToken = AccessToken.getCurrentAccessToken();
                if (accessToken != null) {
                    if(accessToken.getPermissions().contains("user_friends"))
                        fetchScoreboardEntries();
                }
            }

            @Override
            public void onCancel() {
                Log.i(TAG, "LOGIN CANCEL");
            }

            @Override
            public void onError(FacebookException exception) {
                Log.i(TAG, "LOGIN ERROR");
            }
        });