Ok, at this moment I create hidden field in each form definition:
$this->addHidden('formType', $className);
In controller I check formType value from request:
> if ($this->request->getPost('formType') == 'Form1')
> {
> if ($form1->isValid(null, true))
> { }
> }
> if ($this->request->getPost('formType') == 'Form2')
> {
> if ($form2->isValid(null, true))
> { }
> }