title: Magento widget available types
body: <p>I'm developing a widget with Magento. I followed instructions <a href="http://www.magentocommerce.com/knowledge-base/entry/tutorial-creating-a-magento-widget-part-2" rel="nofollow">HERE</a> with success.
  Now i would like to change the behaviour of the backend widget insertion. In particular I would like to change the type of some inputs, from actual multiselect to something else (i'd like to have a file upload).</p>
  
  <p>the code that does this is:</p>
  
  <pre><code>&lt;parameters&gt;
    &lt;enabled_services&gt;
      &lt;label&gt;Enabled Services&lt;/label&gt;
      &lt;visible&gt;1&lt;/visible&gt;
      &lt;required&gt;1&lt;/required&gt;
      &lt;type&gt;multiselect&lt;/type&gt;
      &lt;source_model&gt;widgettwo/services&lt;/source_model&gt;
    &lt;/enabled_services&gt;
  &lt;/parameters&gt;
  </code></pre>
  
  <p>So, instead of multiselect, i'd like to have something else. Where can I find a list of all available types?. Is there a guide somewhere?</p>