title: Add a global search form on all my views with Symfony2?
body: <p>I have a controller with a method that returns a form.</p>
  
  <pre><code>public function showFormAction()
  {
      $form = $this-&gt;createFormBuilder()
          -&gt;add('search', 'search')
          -&gt;getForm()
      ;
  
      return $this-&gt;render('???', array(
          'form' =&gt; $form-&gt;createView()
      ));
  }
  </code></pre>
  
  <p>What must I do to make it visible on all my views?</p>