def change_feeds_topic(self, name):
        """ change feed's topic """
        topicValueselector = self._get_editfeed_topic_valueselector()
        self.pointing_device.click_object(topicValueselector)
        topicValueselector.expanded.wait_for(True)
        newTopic = self._get_editfeed_valueselector_value(name)
        newTopic.visible.wait_for(True)
        self.pointing_device.click_object(newTopic)