title: How to get dropdown menu to work on Statelesswidget
body: <p>I using redux for flutter so every presentation is stateless but i can't get dropdown menu to work property since i can't change it's state to trigger flutter to rebuild the dropdown part when choose value from dropdown.</p>
  
  <p>I trying to implement dropdown menu for <a href="https://github.com/brianegan/flutter_architecture_samples/blob/master/example/redux/lib/presentation/add_edit_screen.dart" rel="nofollow noreferrer">this</a> screen.</p>
  
  <p>My code look something like this:</p>
  
  <pre><code>List&lt;String&gt; _suppliers = &lt;String&gt;['Apple', 'Google'];
  String _supplier = 'Apple';
  
  ...
  
  DropdownButton(
                key: _supplierKey,
                value: _supplier,
                items: _suppliers.map((String value) {
                  return new DropdownMenuItem&lt;String&gt;(
                    value: value,
                    child: new Text(value),
                  );
                }).toList(),
                onChanged: (String newValue) {
                  _supplier = newValue;
                }),
  ...
  </code></pre>
  
  <p>I don't know if i implemented it right or anyway to workaround? Any help would be appreciate. Thanks you.</p>