def combine_expression(self, connector, sub_expressions):
        conn = ' %s ' % connector
        return conn.join(sub_expressions)
Handle the layout initialization for the scroll area.
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.2/django/db/backends/__init__.py/BaseDatabaseOperations.combine_expression--crossover with--dataset/ETHPy150Open ContinuumIO/ashiba/enaml/enaml/wx/wx_scroll_area.py/WxScrollArea.init_layout