Hello Joao,
I am sorry, but without a sample project in which we can observe the issue, there is not much that I can suggest you. Could you please send us your project, so that we can run it here locally. In that way we will be able to track down the source of the problem and provide you with solution.
Looking forward to your reply.
All the best,
Konstantina
the Telerik team
Explore the entire Telerik portfolio by downloading the Ultimate Collection trial package. Get it now >>