title: print_control_identifiers() error in pywinauto
body: <p>I am using pyautowin in WIN10, and I want to open a secure app to generate passcode. But after i find a window of app in script, the print_control_identifiers() function pops error, I'm not sure where goes wrong. Error Window? No controls in app? Please look into below errors.</p>
  
  <p>Code like this:</p>
  
  <pre><code>from pywinauto.application import Application
  app=Application()
  app.start('C:\Program Files (x86)\RSA SecurID Software Token\SecurID.exe')
  RSA=app.window_(title='000131843108 - RSA SecurID Token')
  print RSA
  print RSA.print_control_identifiers()
  </code></pre>
  
  <p>Error like this:</p>
  
  <pre><code>2016-12-30 11:54:01,525 INFO: Imported existing &lt;module 'comtypes.gen' from         'C:\Python27\lib\site-packages\comtypes\gen\__init__.pyc'&gt;
  2016-12-30 11:54:01,526 INFO: Using writeable comtypes cache directory: 'C:\Python27\lib\site-packages\comtypes\gen'  
  &lt;pywinauto.application.WindowSpecification object at 0x039EA670&gt;
  Traceback (most recent call last):
    File "C:/New folder/ConnectVPN.py", line 7, in &lt;module&gt;
      print RSA.print_control_identifiers()
    File "C:\Python27\lib\site-packages\pywinauto\application.py", line 569, in print_control_identifiers
      this_ctrl = self.__resolve_control(self.criteria)[-1]
    File "C:\Python27\lib\site-packages\pywinauto\application.py", line 239, in __resolve_control
      raise e.original_exception
  pywinauto.findwindows.ElementNotFoundError: {'process': 4064, 'backend': u'win32', 'title': '000131843108 - RSA SecurID Token'}
  </code></pre>
  
  <p>My app is like:</p>
  
  <p><a href="https://i.stack.imgur.com/YEwAF.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/YEwAF.png" alt="enter image description here"></a></p>