I'm trying to register a new validator to the available list of validators you can select in a PloneFormGen field.
The task seems simple at the beginning: I registered a new Archetypes validator and I found a way to add it to the dropdown list (through a monkey-patch to add new item to stringValidators tuple) and a call to initStringValidators method of the PFG tool.
Still, selecting my new validator will not lead to anything: the __call__ method is never called.
What I'm missing?