NXCub with new WT G3X, Using GTN

[N815MK]

I know this is only a couple days into the beta, just wondering if I'm doing something wrong.  I'm trying to use the external GTN650 with the NXCub, can't seem to get the Cub to use the GTN for naviagation.  The transponder and radios work, seem to be talking to each other.  But the flight plan from the GTN doesn't seem to transfer to the G3X.  Not showing on the map or the OBS.  I tried switching the nav source from FS to the GTN, nothing different happens.  Thanks.