Unreal Engine 4 is available for Win10 UWP app dev now

That does sound nice. For now, I have it in the FOnlineLeaderboardsLive constructor:



    Windows::Xbox::System::User::SignInCompleted += ref new
        Windows::Foundation::EventHandler<EraAdapter::Windows::Xbox::System::SignInCompletedEventArgs^>(
            =](Platform::Object^, EraAdapter::Windows::Xbox::System::SignInCompletedEventArgs^ args)
    {
        StatisticManager^ mgr = StatisticManager::SingletonInstance;
        if (mgr == nullptr) return;

        mgr->AddLocalUser(args->User->XSAPIUserFromShimUser(args->User));
    });