Hi Robert ,
Thank you for contacting us and for using our RadControls for Windows Phone.
The trial message will be displayed if you are using the assemblies from the trial installation package. You should replace all the referenced assemblies with their Developer version in order to remove the trial message. If you continue to experience the problem you may try to delete the Bin and Obj folders of your project, ensure that the proper Dev assemblies are referenced and rebuild it.
Let me know if you are still experiencing the problem. In the mean time do not hesitate to contact us with any question/problem you may have with our tools.
All the best,
the Telerik team
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