+
+ def changed(self, what):
+ Converter.changed(self, what)
+ if self.type == self.PROGRESS and len(self.downstream_elements):
+ if not self.source.event and self.downstream_elements[0].visible:
+ self.downstream_elements[0].visible = False
+ elif self.source.event and not self.downstream_elements[0].visible:
+ self.downstream_elements[0].visible = True