Problem with generated column with grid layout, Regresion from vaadin 6

Hi, all!
We are experiencing problem with generated column layout in Vaadin 7.1.8.
If we return grid from generate method, our layouts in all cells will be squashed.

I’ve reproduced same screen on Vaadin 6, and it works well.
Bug:
http://dev.vaadin.com/ticket/12970

Could you please give us any hint, how to deal with this?
Thanks

Samples:
Vaadin 6: http://localhost:8086/
Vaadin 7: http://localhost:8087/
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