title: How to customize the submit button rendering?
body: <p>I'm using symfony 2.4 and I need to set my own theme for just the submit button within a form. I was already able to customize the way input fields are rendered, the following code is working.</p>
  
  <pre><code>{% block form_row %}
  {% spaceless %}
  &lt;div class="form-group"&gt;
      {{ form_errors(form) }}
      {{ form_label(form) }}
      {{ form_widget(form, { 'attr': {'class': 'form-control'} }) }}
      {% if help is defined %}
          &lt;span class="help"&gt;{{ help }}&lt;/span&gt;
      {% endif %}
  &lt;/div&gt;
  {% endspaceless %}
  {% endblock form_row %}
  </code></pre>
  
  <p><strong>Question:</strong> Which block do I need to override to accomplish my goal?</p>