Grid setDetails broken after upgrade to 7.6.1

We have a grid with a detailsgenerator. Everything worked fine but after upgrading to 7.6.1 the method getDetails(RowReference rowReference) of the DetailsGenerator is never called.

Anyone has any idea why?

Do you add container after you register detail generator?
If so generator is dropped out when container is set in place.

Thx a lot. That was the problem.