title: Symfony2 how to render Checkboxes?
body: <p>I have a formbuilder form with a multiple choice list of countries.  When I render them on my form like this:</p>
  
  <pre><code>{{ form_widget(edit_form.countries) }}
  </code></pre>
  
  <p>They appear like this:</p>
  
  <pre><code>&lt;input type="checkbox" name="..." value="AD" /&gt;&lt;label for="..."&gt;Andorra&lt;/label&gt;
  &lt;input type="checkbox" name="..." value="AE" /&gt;&lt;label for="..."&gt;United Arab Emirates&lt;/label&gt;
  &lt;input type="checkbox" name="..." value="AF" /&gt;&lt;label for="..."&gt;Afghanistan&lt;/label&gt;
  </code></pre>
  
  <p>I would like each option displayed on it's own line in the browser, instead of all in a row.  How can I inject html around or between the options?  Or is there a CSS method to accomplish this?</p>
  
  <p>Thanks.</p>