I see that you disable the embedded skins. Do you experience the same behavior with the Default skin, without setting the EnableEmbeddedSkins="false" property? If the problem still exists using the Default skin, could you please open a new support ticket and sends me the project which shows the problem? I will check it and do my best to provide a working solution as soon as possible. Also, please provide me with information about the browser which you use.
All the best,
the Telerik team
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