How to apply target value in zend form?

I have the same requirement like PHP + POST an HTML form from inside an iFrame and redirect parent

<form action".." target="_top">
</form>

I am using zend,I开发者_Go百科 have to apply target="_top" in zend form. How can i do this in zend from

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I found it by use ,

$this->setAttrib('target', '_top');