protected unsafe void EnableActionTransportState()
        {
            iCallbackTransportState = new CallbackTransportState(DoTransportState);
            IntPtr ptr = GCHandle.ToIntPtr(iGch);

            DvServiceLinnCoUkRadio1EnableActionTransportState(iHandle, iCallbackTransportState, ptr);
        }
 static extern void DvServiceLinnCoUkRadio1EnableActionTransportState(uint aHandle, CallbackTransportState aCallback, IntPtr aPtr);