code: def popup(self):
          
          if not self.is_initialized:
              self.initialize()
          if not self.proxy_is_active:
              self.activate_proxy()
          self.show = True
docs: Show the notification from code. This will initialize and activate
          if needed.
          
          Notes
          ------
          This does NOT block. Callbacks should be used to handle click events
          or the `show` state should be observed to know when it is closed.