Ako zaregistrovat control v extension

Caute neviete ma nasmerovat neviem co robim zle:
mam control:

class ItemsPerPage extends Control
{
	......

	public function __construct(Request $httpRequest, Response $httpResponse)
	{
		parent::__construct();
		$this->httpRequest = $httpRequest;
		$this->httpResponse = $httpResponse;
	}

	.....
}

potom extension:

class ItemsPerPageExtension extends CompilerExtension
{
	....

	public function loadConfiguration()
	{
		$config = $this->getConfig($this->defaults);

		$builder = $this->getContainerBuilder();

		$builder->addDefinition($this->prefix('itemsPerPage'))
			->setFactory('NasExt\Controls\ItemsPerPage');
	}

	....

}

predpokladam ze som si vyrobil factory ItemsPerPage, dalej by som si ju chcel injectnut do presentra a pouzivat:

private $itemsPerPage;

public function injectItemsPerPage(ItemsPerPage $itemsPerPage)
{
	$this->itemsPerPage= $itemsPerPage;
}


createComponentIpp(){
	$control = $this->itemsPerPage;
	......
	return $control;

}

co je na tomto navrhu zle? lebo ladenka mi nadava:

Component name must be integer or string, NULL given

Neviete mi poradit ako to riesit? Dakujem.