Hello Alan,

We have documented that the grid validation works only with DataAnnotationsValidator (see the bullet about validation in the Notes section), the FluentValidator is a third party tool that we can't support because we can't encumber all our customers with such a dependency.

If you want to use third party validators, they must integrate with an EditContext, and you can receive it as a regular cascading parameter in a custom component in the editor template (this is how one would handle any custom integration with an EditContext anyway).

With that said, I must mark this as "declined" because it is not a valid bug in the scenarios the component supports.

As for the second case you report where the grid becomes unresponsive - unsatisfied validation should not allow you to close the cell in the first place. Once a row closes for editing altogether, there should be no edit context. If you can reproduce a problem with a valid scenario, please modify the sample from the docs and send it to us (preferably in a new ticket/thread so we can keep each discussion concise).

Regards,
Marin Bratanov
Progress Telerik