Simple OA Extension question

Hello,
I have made a substitution of a OA View Object and want to replace the logic in some of the RowImpl methods. I have created a new object and substituted in .jpx. The substituition works fine, and my xxxVOImpl constructor runs. However, none of my methods in xxxVORowImpl runs, and the xxVORowImpl never gets instantiated (the constructor never runs).
What could be wrong?

PS: The default row class runs in stead of the xx row class, even though the View Object is substituted

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