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copied!<p>I'm not sure if this counts as an answer <em>per se</em> but I ended up avoiding the need for a custom widget by creating custom Source & SourceBinder objects.</p> <pre><code>class CTCCSource(object): implements(IVocabularyTokenized) container = None content_type = None def __init__(self, context): self.context = context container_path = self._container_path(context) self.catalog = getToolByName(context, 'portal_catalog') self.intid_utility = getUtility(IIntIds) self.content = [i.getObject() for i in self.catalog(portal_type=self.content_type, path={'query': container_path})] def _container_path(self, context): physical_path = list(context.getPhysicalPath()) trial_path = physical_path[:physical_path.index('sites')] criteria_path = trial_path + [self.container] return '/'.join(criteria_path) def __contains__(self, term): return term in self.content def __iter__(self): for crit in self.content: yield SimpleTerm(crit, self.intid_utility.getId(crit), crit.Title) def __len__(self): return len(self.content) def getTerm(self, obj): return SimpleVocabulary.createTerm( obj, self.intid_utility.getId(obj), obj.Title() ) def getTermByToken(self, value): return self.getTerm(self.intid_utility.getObject(int(value))) class CTCCSourceBinder(object): implements(IContextSourceBinder) source = None def __init__(self, **kw): pass def __call__(self, context): return self.source(context) </code></pre> <p>This allowed me to produce form checkbox fields from content contained within the current context, adding references to the chosen options into a RelatedList.</p>

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