title: Symfony 2 form theme with choice field
body: <p>I have problem. I want to do choices country with flag ico but I don't know how to create custom theme for form choice filed.</p>
  
  <p>I created test form :</p>
  
  <pre><code>-&gt;add('name', 'choice', array('choices' =&gt;array('en' =&gt; 'England', 'de' =&gt; 'Deutshland')))
  </code></pre>
  
  <p>Next in my view I try </p>
  
  <pre><code>{% block _send_name_widget %}
      &lt;select&gt;
          {% for f in form %}
              {{ loop.index }}
          {%endfor%}
      &lt;/select&gt;
  {% endblock%}
  
  {{ form_widget(form.name) }}
  </code></pre>
  
  <p>And in my html code I've got:</p>
  
  <pre><code>&lt;select&gt;
   1
   2
  &lt;/select&gt;
  
  &lt;select&gt;
  &lt;/select&gt;
  </code></pre>
  
  <p>Could you tell me why? 
  How can I render only one select with parameters? </p>