title: How to set Decorators for Input type file Elements?
body: <p>I have the following piece of code,
  Under myClass , i have set decorators variable,</p>
  
  <pre><code> public $testDecorators = array(
      'ViewHelper',
      'Errors',
      array('Description', array('escape' =&gt; false, 'tag' =&gt; '', 'placement' =&gt; 'append')),
      array(array('data' =&gt; 'HtmlTag'), array('tag' =&gt; 'div', 'class' =&gt; 'itemR')),
      array('Label', array('tag' =&gt; 'div', 'class' =&gt; 'itemL')
      ),
      array('HtmlTag', array('tag' =&gt; 'div', 'class' =&gt; 'itemcontent'))
  );
  </code></pre>
  
  <p>Under CreateForm function,</p>
  
  <p>....</p>
  
  <pre><code>    $cover_image = new Zend_Form_Element_File('cover_test', array(
        'label' =&gt; 'Cover Test:',
        'value'   =&gt; '',
        'class' =&gt; 'test',
        'tabindex' =&gt; '5',
        'required' =&gt; false,
        'filters' =&gt; array('StringTrim'),
            'decorators' =&gt; $this-&gt;testDecorators,
      ));
  </code></pre>
  
  <p>....</p>
  
  <p>When i use this decorators, nothing is displaying in my form, if commented that <code>'decorators' =&gt; $this-&gt;testDecorators,</code> form is coming fine with default dd tag, Kindly help me</p>