I am afraid that the provided information is not sufficient enough to determine what is going wrong. As I said in my previous reply, it would be best to send me a small but runnable project that shows your current implementation and replicates the issue.
I tested your scenario in a sample page and got everything to work as expected on my side. For convenience I am attaching the test project.
In case you need any further assistance, I would like to recommend that you open a support ticket, preferably with a runnable project attached. We will do our best to help.
the Telerik team
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