protected unsafe void EnableActionSetPlayMode()
        {
            iCallbackSetPlayMode = new CallbackSetPlayMode(DoSetPlayMode);
            IntPtr ptr = GCHandle.ToIntPtr(iGch);

            DvServiceUpnpOrgAVTransport2EnableActionSetPlayMode(iHandle, iCallbackSetPlayMode, ptr);
        }
 static extern void DvServiceUpnpOrgAVTransport2EnableActionSetPlayMode(uint aHandle, CallbackSetPlayMode aCallback, IntPtr aPtr);