Android : How to set OnCreateView function for the Facebook login on adroid

i'm trying to do the facebook login for an android app. i'm getting to this step, to define the OnCreateView function.

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View view = inflater.inflate(R.layout.fragment_main, container, false);
    LoginButton authButton = (LoginButton) view.findViewById(R.id.authButton);

    authButton.setFragment(this);


    return view;
}

My problem is that for this line authButton.setFragment(this); (this) refer to my Main Fragement and no to android.support.V4.app.Fragement. So how can i resolve it

Thanks