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    def populateComboEntry(self, combo, type_, func, sort = None):
        model = gtk.ListStore(gobject.TYPE_STRING, gobject.TYPE_INT)
        combo.set_model(model)
        combo.set_text_column(0)
        result = self.backend.search(type_)
        if sort:
            result.sort(sort)
        for r in result:
            model.append(("%s"%func(r), hasattr(r, "id") and r.id or 0))