I followed the link from the manual (coming from the 2.7RC new features)
Hi!
The manual, as well as the demo applications, are in development until public announcement and release. We don’t update our demo apps to unstable versions (the RC version is not stable).
You will be able to try out the card demo immediately after release. If you need to do this as soon as possible, please let me known, and I will provide a way to run this example locally.
Best regards,
Dmitriy
Hi @d.kremnev
Sorry to jump in this thread. I understand the implications. But if you would like, that we check the RC-Version, it would help when there would be somewhere a RC-Version of the demo. I did want to try out the groupDataGrid with the same result (= not working). So if a RC-Version of the demo apps would exist, perhaps we could test it and give some feedback. On the other hand I understand too, that you have more important things to do 
Best regards
Felix
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