public function toForm(){
        $returnValue = null;

        $choiceFormClass = '\\oat\\taoQtiItem\\controller\\QTIform\\choice\\'.ucfirst(static::$qtiTagName);
        if(!class_exists($choiceFormClass)){
            throw new QtiModelException("the class {$choiceFormClass} does not exist");
        }else{
            $formContainer = new $choiceFormClass($this);
            $myForm = $formContainer->getForm();
            $returnValue = $myForm;
        }

        return $returnValue;
    }