frames.php
protected function findFormInFrame($page, $index, $method, $attribute)
    {
        $form = $this->frames[$index]->$method($attribute);
        if (isset($form)) {
            $form->setDefaultTarget($this->getPublicNameFromIndex($index));
        }

        return $form;
    }
protected function findFormInFrame($page, $index, $method, $attribute)
    {
        $form = $this->frames[$index]->$method($attribute);
        if (isset($form)) {
            $form->setDefaultTarget($this->getPublicNameFromIndex($index));
        }

        return $form;
    }
Finds a form in a page using a form finding method.
Will also tag the form with the frame name it belongs in.

@param SimplePage $page  Page content of frame.
@param int $index    Internal frame representation.
@param string $method    Method to use to find in a page.
@param string $attribute Label, name or ID.

@return SimpleForm       Form object containing the matching ID.