Tabbing between controls could be a very complex if you have controls located in another controls and etc.
On the other hand the TabIndex property could be used in order to set a tabbing priority.
We are unable to reproduce your issue in our environment, so we would highly appreciate if you can elaborate more on your scenario - do you have nested controls, which they are, do you use tab indices. It would be nice if you can send us a runnable sample illustrating the problem. This way we would provide you with a better suited solution. Thank you in advance for your cooperation.
the Telerik team
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