title: How to make file_reference in extbase extension in TYPO3 6.1 work?
body: <p>I have set up a small extension with the extension builder containing a few fields, one of which is the internal_type: 'file_reference'.</p>
  
  <pre><code>'dokument' =&gt; array(
      'exclude' =&gt; 0,
      'label' =&gt; 'LLL:EXT:publikationen/Resources/Private/Language/locallang_db.xlf:tx_publikationen_domain_model_publikation.dokument',
      'config' =&gt; array(
          'type' =&gt; 'group',
          'internal_type' =&gt; 'file_reference',
          //'uploadfolder' =&gt; 'uploads/tx_publikationen',
          'allowed' =&gt; '*',
          'disallowed' =&gt; 'php',
          'size' =&gt; 5,
      ),
  ),
  </code></pre>
  
  <p>The field appears in the backend, but the Element browser is unable to show any files to select:</p>
  
  <p><img src="https://i.stack.imgur.com/USd4R.jpg" alt="enter image description here"></p>
  
  <p>If I remove the "bparams" parameter from the URL shown above, it is able to see the files that are there.</p>
  
  <p>How can this be brought to work?</p>