The behavior you are experiencing is expected. In order to add a custom method to the proxy classes on the client side, you would have to extend the proxy classes themselves. This is done again with defining a partial class with the same name and namespace as the one you wish to extend but in another code file. Please refer to this documentation article
, under the Implementing Partial Methods
segment, which describes the process.
I hope this helps. Should you have additional questions or need assistance, feel free to post at our forums again.
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. For more information on the new names, please, check out the Telerik Product Map