code: def set_value(self, value):
          
          self._value = value
  
          for proxy in self.get_proxies():
              proxy.handler_block(self._changed_handlers[proxy])
              proxy.set_value(self._value)
              proxy.handler_unblock(self._changed_handlers[proxy])
              pass
  
          self.emit('changed')
          return
docs: Set value to action.