Hi Michel ---

>There are other problems too : if you do not want the form to
>even initialize depending on the value of some of the parameters,
>am I right in saying that the only way to do it inside a formset
>is to have the form initialize as HIDDEN and then either un-hide it
>or release it depending on what the parameters are ?
>

I don't think you can prevent the form from Initializing at all but you can hide it. I'm not that familiar with Formsets but an idea has occurred to me: What if you created the Forms as standalone classes (remove them from formset) and then used "AddObject" where appropriate to dynamically add them? I have no clue if this would work but......???