Hello Moiez,
I have answered in the support thread opened on the subject. I would like to ask you continue our discussion in only one thread to avoid duplication. You can post updated to this thread once the problem is solved if you would like to share the solution for other users.
Here is a quote of the first answer:
In general, you would need to define the whole DataSource structure and pass it to the attribute. Although this approach is achievable, it will lead to hard to maintain widget declaration. I would suggest you check this help topic, that shows the possible way to initialize widgets from mark-up. Based on the given code snippets, I would suggest you configure your widget in this way:
Regards,
Georgi Krustev
Telerik
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