title: How to change TextField text from Store with flutter_flux?
body: <p>In the <a href="https://github.com/flutter/flutter_flux" rel="nofollow noreferrer">flutter_flux example</a> when we commit a new message, the <code>_currentMessage</code> is emptied but the <code>TextField</code> does not reflect that changes.</p>
  
  <p>This is the code in the store:</p>
  
  <pre class="lang-dart prettyprint-override"><code>triggerOnAction(commitCurrentMessageAction, (ChatUser me) {
        final ChatMessage message =
            new ChatMessage(sender: me, text: _currentMessage);
        _messages.add(message);
        _currentMessage = '';
      });
  </code></pre>
  
  <p>The view uses a <code>TextEditingController</code> as a controller for the <code>TextField</code> Widget so I understand why it is not updated.</p>
  
  <p>How can we empty the <code>TextField</code> from the Store with flutter_flux?</p>