private void OnLoginFailed()
        {
            InvokeOnMainThread(() =>
            {
                if (FacebookCoreKit.AccessToken.CurrentAccessToken != null)
                {
                    FacebookLoginKit.LoginManager fbLoginManager = new FacebookLoginKit.LoginManager();
                    fbLoginManager.LogOut();
                }

                UIAlertView error = new UIAlertView("Error", "An error occured during login", null, "Ok", null);
                error.Show();

                ViewHelpers.RemoveLoadingOverlay(View);
            });
        }