I think a4j:param can only be used as a child of a UICommand component, so instead use a valueChangeListener.
>child of a UICommand
Puh, I guess I have to learn some of the basics. Thanks for the hint.
I'm working for about 9 months (not primarily) with JSF and Richfaces,
but even now it seems to me, from time to time at least, as if I'd be an
absolute beginner. It's a little bit frightening. When I explain the basics of
JSF to someone, it all seems so simple and elegant, but when simple
problems (lacking some understanding on my part) occur, the right answer
is sometimes so far away or needs deep understanding of the JSF framework.
But I'll keep trying
I know just what you mean, there are a lot of gotchas.