How do I use ViewScripts on Zend_Form File Elements?

Question

I am using this ViewScript for my standard form elements:

element->getId(); ?>\">
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Answer 1

I've found a work-around that avoids the ViewScript altogether.

First, the element definition:

$this->addElement('file', 'upload_file', array(
    'disableLoadDefaultDecorators' => true,
    'decorators' => array(
        'File',
        array(array('Value'=>'HtmlTag'), array('tag'=>'span','class'=>'value')),
        'Errors',
        'Description',
        'Label',
        array(array('Field'=>'HtmlTag'), array('tag'=>'div','class'=>'field file')),
    ),
    'label' => 'Upload File',
    'required' => false,
    'filters' => array('StringTrim'),
    'validators' => array(),
));

Second, after the form class has been instantiated, I mimic the behavior of my ViewScript:

$field = $form->getElement('upload_file');
$decorator = $field->getDecorator('Field');
$options = $decorator->getOptions();
$options['id'] = 'field_' . $field->getId();
if ($field->hasErrors()) {
    $options['class'] .= ' errors';
}
$decorator->setOptions($options);

I guess that I should look into class-based decorators. Maybe there's more flexibility there?