internal AudioSessionControl(IAudioSessionControl2 realAudioSessionControl)
 {
     IAudioMeterInformation _meters = realAudioSessionControl as IAudioMeterInformation;
     ISimpleAudioVolume _volume = realAudioSessionControl as ISimpleAudioVolume; 
     if (_meters != null)
         _AudioMeterInformation = new Windows7.AudioMeterInformation(_meters);
     if (_volume != null)
         _SimpleAudioVolume = new SimpleAudioVolume(_volume);
     _AudioSessionControl = realAudioSessionControl;
     
 }
        internal AudioSessionControl(IAudioSessionControl2 realAudioSessionControl)
        {
            IAudioMeterInformation _meters = realAudioSessionControl as IAudioMeterInformation;
            ISimpleAudioVolume     _volume = realAudioSessionControl as ISimpleAudioVolume;

            if (_meters != null)
            {
                _AudioMeterInformation = new Windows7.AudioMeterInformation(_meters);
            }
            if (_volume != null)
            {
                _SimpleAudioVolume = new SimpleAudioVolume(_volume);
            }
            _AudioSessionControl = realAudioSessionControl;
        }