def getAnalysisServicesVocabulary(self):
        """
        Get all active Analysis Services from Bika Setup and return them as Display List.
        """
        bsc = getToolByName(self, 'bika_setup_catalog')
        brains = bsc(portal_type='AnalysisService',
                     is_active=True)
        items = [(b.UID, b.Title) for b in brains]
        items.insert(0, ("", ""))
        items.sort(lambda x, y: cmp(x[1], y[1]))
        return DisplayList(list(items))
Get all active Analysis Services from Bika Setup and return them as Display List.