The provided information is not enough to localize the issue. So we need a further assistance to figure out what is wrong. First of all could you confirm that you mean RadPane
control and not RadPanel
Also, what are the exact steps for reproducing the problem? Do you replicate it on a public page or in page edit mode? It will be very helpful if you provide us with an online access to your project to investigate the issue.
Thanks for your cooperation in advance.
the Telerik team
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