title: Extjs reset filefield input
body: <p>How reset filefield input in ExtJS? I am trying:</p>
  
  <pre><code>//this - point on Ext.panel.Form
  
  var form = this.getForm();
  form.reset();
  
  var filefield = this.getForm().getFields().get(0);
  filefield.reset();
  
  filefield.setValue('');
  
  filefield.value = '';
  </code></pre>
  
  <p>But not one of these methods don't work. Thank you for help!</p>