arra array element to quickform?

Is it possible to add array text element to quickform?

Aviously code below do not work but can it be done somehow?
The problem is in -> "parent['foo']"

$this->form->addElement('text', "parent['foo']" , 'parent', array('value'=>$id, 'size' => 50, 'maxlength' => 255));

Answered on pear-forum.org ...

Please ask only once.

Thanks for the info.
I never send multiple messages in same forum site.

But in multiple forums ...

It's quite annoying if somebody replies to your question, while the question was already answered in another forum.

OK in case some one have same problem solution is:
Change "parent['foo']" to "parent[foo]"