Set the context property of the DataGrid for Contact to shared.
Set the context property of the DataGrid for Address to listen.
However, shared context only works if the association is Contact 0 - 1 Address.
So, more general, the object in the DataGrid with the context property on listen should have a 1-0 relation with the object in the Datagrid with the context property on shared.
Contact = shared
Address = listen