title: File upload callback in Agile tookit
body: <p>I have a agile File input, im using the model File from addons, at the moment without any extend or modifications.</p>
  
  <pre><code>    $f=$this-&gt;add('Form');
      $modelo  = $this-&gt;add($this-&gt;model);
  
      $f-&gt;addField('upload','Upload_test','Upload Test')-&gt;setModel($modelo);
      $elemento = $this-&gt;add('HtmlElement');
  
      $t = $this;
  
      $modelo-&gt;addHook('afterSave',function($m) use($t, $elemento)
      {
  
          $t-&gt;js(true)-&gt;univ()-&gt;alert('Uploaded!');
          $elemento-&gt;set('Uploaded');
  
      });
  
      $f-&gt;onSubmit(function($f) use($t){
          $t-&gt;js(true)-&gt;univ()-&gt;alert(333)-&gt;execute();
      });
  </code></pre>
  
  <p>The callback are triggering but, any modifications to the actual html are failed, also any js like the simple alert saying Uploaded. How can I execute some PHP like $elemento->set('Uploaded'); to inform of the recently uploaded file? The JS with the alert also doesnt work :(</p>
  
  <p>Any help would be apreciated</p>