Hello Jc Mag,
Unfortunately this seems to be an error in the documentation, you still need to create and implement the abstract FluentMetadataSource. The PrepareMapping you have to override should just return an empty list. With this setup, during runtime the mapping will be collected from all of the classes having a static method that returns a MappingConfiguration.
We will be updating the help topic immediately. Thank you for noticing this error.
I hope this helps.
the Telerik team
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