code: def redo(self, channel, image):
          
          chname = channel.name
  
          # Only update our GUI if the activity is in the focused
          # channel
          if self.active == chname:
              imname = image.get('name', 'NONAME')
              self.set_info("A new image '%s' has been added to channel %s" % (
                  imname, chname))
          return True
docs: Called from the reference viewer shell when a new image has
          been added to a channel.