title: pywinauto does not detect child window
body: <p>I'm using the latest version (to date) of pywinauto; and also using PyInspect (uia) to identify controls.</p>
  <p>I'm automating controls on an application, and part of the process is to check a few boxes on a window that pops up after triggering the window to appear from a menu selection (like Edit-&gt;Settings).</p>
  <p>The problem is, pywinauto doesn't seem to be able to detect the new window. I see successfully opens; and can see the window and elements as a sub (child?) window of the application in PyInspect.</p>
  <p>I've tried wait methods, thinking the automation is occurring too fast- but to no avail. something like:</p>
  <p><code>mysettings = app['app-name'].child_window(title_re=&quot;my target settings window&quot;, class_name=&quot;#32770&quot;).wait('exists', timeout=10)</code></p>
  <p>this will just timeout. And if I print control identifiers, &quot;my target settings window&quot; is never included.</p>
  <p><code>app['app-name'].print_control_identifiers()</code></p>
  <p>I also tried set_focus on top_window.. that didn't work either. My conclusion is that pywinauto is having trouble detect that it is there. Any thoughts on this?</p>