This code is not rendered from our controls and, probably, it is declared somewhere in your project. You can check it by performing a global search using Visual Studio's Find and Replace
dialog. In case that the you cannot find the solution of the problem, however, could you please open a new support ticket and send me a project where I can reproduce the problem? I will check it and do my best to provide a solution as soon as possible.
the Telerik team
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