title: pywinauto NoPatternInterfaceError select value in ComboBox
body: <p>I am getting <strong>NoPatternInterfaceError</strong> exception when trying to select a value from ComboBox</p>
  
  <p>Any help will be much appreciated</p>
  
  <pre><code>batch_combobox = wnd_spec_obj.child_window(
      title='Batch class:',
      auto_id='27651',
      control_type='ComboBox').wait('exists enabled visible ready', timeout=50, 
  retry_interval=0.25)
  
  batch_combobox.select('Mail')
  </code></pre>
  
  <p>when i print the batch_combobox, i get </p>
  
  <pre><code>  uia_controls.ComboBoxWrapper - 'Batch class:', ComboBox
  </code></pre>
  
  <p><strong>workaround</strong></p>
  
  <pre><code>from pywinauto.controls.win32_controls import ComboBoxWrapper
  ComboBoxWrapper(batch_combobox).select('Mail')
  </code></pre>