title: Python mechanize click submit on multi submit form
body: <p>I have to click on the first submit on a multi submit form. The submit code is as below:</p>
  
  <pre><code>        &lt;div class="grid "&gt;
              &lt;div class="grid__item grid-u-2-10"&gt;
                  &lt;label class="form__label"&gt;Auto-Fill:&lt;/label&gt;
              &lt;/div&gt;
              &lt;div class="grid__item grid-u-8-10" id="autofill-button-container"&gt;
                  &lt;input type="button" id="autofill" name="autofill" value="Auto-Fill" class="form__input" onclick="AutoFill();"  /&gt;&amp;nbsp;&amp;nbsp;Use AutoFill first, as it will replace everything below.
              &lt;/div&gt;
          &lt;/div&gt;
  </code></pre>
  
  <p>I tried:</p>
  
  <pre><code>br.open(url+"upload.php")
  
  br.select_form(nr=7)
  r = br.submit(label='Auto-Fill')
  </code></pre>
  
  <p>however it returns:</p>
  
  <pre><code>mechanize._form.ControlNotFoundError: no control matching kind 'clickable', label 'Auto-Fill'
  </code></pre>
  
  <p>Pls help.</p>