run leap motion in background on osx c++

Question

since SDK Version 0.8 my app does not run in background anymore. has someone an idea?

class LeapController :public Leap::Listener
{
    //...

    void onInit(const Leap::Controller& controller) 
    {
        std::cout << "Initialized" << std::endl;
        // here i set the app to run in background:
        controller.setPolicyFlags(Leap::Controller::POLICY_BACKGROUND_FRAMES);
    }
    //...

};