protected unsafe void EnableActionSourceName()
        {
            iCallbackSourceName = new CallbackSourceName(DoSourceName);
            IntPtr ptr = GCHandle.ToIntPtr(iGch);

            DvServiceLinnCoUkProduct3EnableActionSourceName(iHandle, iCallbackSourceName, ptr);
        }
 static extern void DvServiceLinnCoUkProduct3EnableActionSourceName(uint aHandle, CallbackSourceName aCallback, IntPtr aPtr);