Martin,

thanks for the prompt reply.  One of the constraints is not knowing what the
various potential combinations of form fields will be - I have a SelectBox
that allows the selection of a list of values, and when you select one, an
ajax request is done (passing the value you selected) to retrieve the list
of form fields that need to be rendered.  These retrieved fields need to be
inserted into the middle of a larger form.

Looking at the source of the classes involved (Form, Controller, validation
Manager, Resetter, Renderer etc) it looks like the easiest option is just to
create a new Form and Renderer (and all the other bits and pieces) each time
the Form changes, and have that new copy renderered, rather than try and
change the instances I already have.  Its not efficient, but it means I
still get the benefit of all the functionality those classes provide, and I
don't have to do lots of extending qooxdoo classes.

That being the case, I'll need to maintain the Model myself, and build the
form from that.  Does that sound about right?

Thanks,

Jamie
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