Unfortunately the RadPersistenceFramework doesn't support multi-plaform persisting scenarios.
The PersistenceFramework basically allows you to persist your UI layout either in a file in the isolated storage or in a stream. Even though it's up to you to decide how to store the information, the framework needs the StorageId of the controls to restore the settings of the controls persisted in the isolated storage or the stream if you've saved the settings in one.
I hope this information will help you. Let us know if we can assist you with anything else.
the Telerik team
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