The article you found contains the two possible options for implementing the display of related entities. The usage of grouping is the first one of them. The second one, here
, is the one that I recommend you and it involves the usage of two datasources. The workflow is described in details in the article, so to this message I am attaching a sample that shows the implementation and the outcome. It is configured to allow automatic updates through the datasource consumed by the grid, and utilizes the Northwind database (you need to make it available on your side).
On the side, the reason why the automatic updates are disabled when you use grouping through the datasource is that the result is actually a projection and does not consume the real persistent type. In such cases Data Access does not support change tracking.
I hope this helps. Let us know how the things on your side are.
OpenAccess ORM is now Telerik Data Access
. For more information on the new names, please, check out the Telerik Product Map