This only applies if plone.app.kss is installed.
from z3c.form import fields, form
from z3c.form.interfaces import INPUT_MODE
from plone.app.z3cform.wysiwyg.widget import WysiwygFieldWidget
class PersonForm(form.Form):
fields = field.Fields(IPerson)
fields['bio'].widgetFactory[INPUT_MODE] = WysiwygFieldWidget
from zoep.schema import Set, Choice
from plone.app.z3cform.queryselect import ArchetypesContentSourceBinder
class IRelated(Interface):
related = Set(
title=u"Related",
description=u"Related content",
value_type=schema.Choice(source=ArchetypesContentSourceBinder()))