I tried to replicate the issue described by you in a sample project but to no avail. I am attaching it to this post. Could you please review it and let me know if I am missing anything out?
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I am not able to run your code, it states "the page is not valid". I am running it from an isolated server as the local policy does not allow me to have a sandbox with an outside connection enabled which have some sort of importance.
Have to precise the code snippet provided is refering to a RadGrid implementation. I will try to open a ticket providing a runnable code still today.