title: Mechanize does not see some hidden form inputs?
body: <p>I want to scrape <a href="http://recognition.ncqa.org/PSearchResults.aspx?state=ME&amp;rp=" rel="nofollow noreferrer">this web page</a> using Mechanize. The form element looks like this:</p>
  
  <pre><code>&lt;form name="ctl00" method="post" action="PSearchResults.aspx?state=ME&amp;amp;rp=" id="ctl00"&gt; 
  &lt;div&gt; 
  &lt;input type="hidden" name="__EVENTTARGET" id="__EVENTTARGET" value="" /&gt; 
  &lt;input type="hidden" name="__EVENTARGUMENT" id="__EVENTARGUMENT" value="" /&gt; 
  &lt;input type="hidden" name="__VIEWSTATE" id="__VIEWSTATE" value="verylongstring" /&gt; &lt;/div&gt; 
  &lt;input type="hidden" name="__EVENTVALIDATION" id="__EVENTVALIDATION" value="/wEWAgKb7POZAwK4v7ffCOmari00yJft/iuZBMdOH/zh9TDI" /&gt; 
  &lt;/div&gt; 
  &lt;/form&gt;
  </code></pre>
  
  <p>I'm using Mechanize to print out the controls, but it can only see two of them. If I run this:</p>
  
  <pre><code>    br.select_form(name='ctl00')
      br.form.set_all_readonly(False) # allow changing the .value of all controls
      for control in br.form.controls:
          if not control.name:
              print " - (type) =", (control.type)
              continue  
          print " - (name, type, value) =", (control.name, control.type, br[control.name])
  </code></pre>
  
  <p>all that gets printed is this:</p>
  
  <pre><code>- (name, type, value) = ('__VIEWSTATE', 'hidden', '/wEPDwUGNDQ5NTMwD2QWAgIBD2QWAgIHD2QWCgIBDw8WAh4E...more
  - (name, type, value) = ('__EVENTVALIDATION', 'hidden', '/wEWAgKb7POZAwK4v7ffCOmari00yJft/iuZBMdOH/zh9TDI')
  </code></pre>
  
  <p>Why can't Mechanize 'see' the __EVENTTARGET and __EVENTARGUMENT fields?</p>