Class DuplicatesContainer extends Nette\Forms\Container
{
    private $duplicates;


    public function __construct($duplicates)
    {
        parent::__construct();
        $this->duplicates = $duplicates;
    }


    protected function attached($obj)
    {
        parent::attached($obj);
        if (!$obj instanceof Nette\Forms\Form) {
            return;
        }

        $this->currentGroup = $this->getForm()->addGroup('Duplikované kódy produktů');
        foreach ($this->duplicates as $duplicate) {
            $this->addText($duplicate->id, $duplicate->title)
                ->setDefaultValue($duplicate->title);
        }
    }

}


# použití

$form = new Nette\Application\UI\Form();
$form['duplicates'] = new DuplicatesContainer($duplikace); // tady doplníš pole toho co se opakuje

echo $form; // vyrenderuje se tak jako máš na obrázku