To keep a long story short, this article does not work in my v9 instance (perhaps some custom extension functionality has been deprecated since v7?)
Any ideas? Thanks all!
In my case I was using it for a subpanel on a flex-relate and I found a much better workaround:
There is an example of how to use JoinTable here:
I think that is still the recommended solution in v9
Sorry I could not be of more help. You could try searching the community by "JoinRaw" there are several threads about it, maybe one of them contains a solution.