ADX not displaying subgrid

Hello,

I have CRM entity with a subgrid on it.  The subgrid does not display on the ADX portal AT ALL.  The webinars and developer guide say that a subgrid should at least show as read-only simply by adding it to the CRM form.  My subgrid isn't displaying at all.  I have tried both on an very simplified entity form and a more complex web form and the same behavior.

Any suggestions?