We already have the functionality in the resources - you could implement the IResource interface and plug it into your IAppointment implementation. There is some more work that has to be done, but I hope that for the official release we will properly clear this area. Most probably we will create similar interfaces for the Category and the TimeMarker classes, thus allowing the developers to store them into a database.
You should be able to replicate the Category/TimeMarker functionality with simple resources, but again you would have to write code.
the Telerik team
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