code: public function addDynamic($name, $factory, $createDefault = 0, $forceDefault = false)
      {
          $control = new RContainer($factory, $createDefault, $forceDefault);
          $control->currentGroup = $this->currentGroup;
          return $this[$name] = $control;
      }
docs: Adds replicable container
  @param $name
  @param $factory
  @param int $createDefault
  @param bool $forceDefault
  @return Container