protected unsafe void EnableActionGetSortExtensionCapabilities()
        {
            iCallbackGetSortExtensionCapabilities = new CallbackGetSortExtensionCapabilities(DoGetSortExtensionCapabilities);
            IntPtr ptr = GCHandle.ToIntPtr(iGch);

            DvServiceUpnpOrgContentDirectory3EnableActionGetSortExtensionCapabilities(iHandle, iCallbackGetSortExtensionCapabilities, ptr);
        }
 static extern void DvServiceUpnpOrgContentDirectory3EnableActionGetSortExtensionCapabilities(uint aHandle, CallbackGetSortExtensionCapabilities aCallback, IntPtr aPtr);