Dropdown menu inside of a dropdown menu is not found by testcomplete

I've suffered with accessing combobox and radcombobox WPF items many times.  The most reliable method I found for selecting those is using a loop with FindChild.  Below is an example of the approach I've used for combo box items.  Not sure if that will help/work in your case though.

  '-- Set the operator combo box as specified. 
  a_Props = Array("ClrClassName", "WPFControlText")
  a_vals = Array("TextBlock", s_Operator)
  o_cboOperator.Click
  Set o_menu = Aliases.Sys.Ezp.HwndSource_PopupRoot.PopupRoot.Decorator.NonLogicalAdornerDecorator
  Set o_item = o_menu.FindChild(a_props, a_vals, 2)
    If o_item.Exists Then 
        o_item.Click
      Else
        'Log an error if the item was not found
        Log.Error "The item " & s_Operator & " was not found"
  End If

I don't think we have a flyout menu like yours in our application. 

WPF is not the most TestComplete friendly.  The really, really deep hierarchy is a nuisance.

Good luck, John