title: Custom combo box recognition in pywinauto
body: <p>I have below custom combo box.</p>
  
  <p>i tried to select <code>item</code> or get <code>itemcount</code> from <code>ComboboxWrapper</code> from the field, but i guess <code>pywinauto</code> is not able to identify the object.</p>
  
  <p>I cannot use <code>auto_id=CheckboxEdit</code> as its not unique and we have 6 combobox in the frame.</p>
  
  <pre><code>combobox = app.Dialog.child_window(auto_id="AgrementTypeFilter", control_type="ComboBox").wrapper_object()
  comboitems = combobox.item_count()
  </code></pre>
  
  <p>Can somebody check on this? Thanx.</p>
  
  <pre><code>Custom - ''    (L-1904, T328, R-1750, B374)
  ['', 'Custom', '0', '1', 'Custom0', 'Custom1']
  child_window(auto_id="AgrementTypeFilter", control_type="Custom")
     | 
     | Static - 'Agreement Type'    (L-1900, T330, R-1754, B346)
     | ['Static', 'Agreement TypeStatic', 'Agreement Type']
     | child_window(title="Agreement Type", control_type="Text")
     | 
     | Custom - ''    (L-1900, T350, R-1754, B372)
     | ['2', 'Custom2', 'Agreement TypeCustom']
     | child_window(auto_id="Combo", control_type="Custom")
     |    | 
     |    | ComboBox - ''    (L-1900, T350, R-1754, B372)
     |    | ['ComboBox', '3', 'ComboBoxCCP']
     |    | child_window(auto_id="CheckBoxEdit", control_type="ComboBox")
  </code></pre>