FlexNativeMenu issues under AIR SDK 3.9

Hello,

I'm trying to recreate a custom XML-based FlexNativeMenu (an Adobe.com example) by using the latest air sdk 3.9 (flex sdk 4.6.0 + air sdk 3.9)... The mxml code I'm trying to run is:

<?xml version="1.0" encoding="utf-8"?>
<!-- aircomponents/src/NativeMList.mxml -->
<s:WindowedApplication xmlns:fx="http://ns.adobe.com/mxml/2009" 
                                                     xmlns:s="library://ns.adobe.com/flex/spark" 
                                                     xmlns:mx="library://ns.adobe.com/flex/mx" menu="{testMenu}"> 
  <fx:Declarations>
  <!-- The XML data provider --> 
                    <fx:XML format="e4x" id="menuData"> 
                              <root> 
                                        <menuitem label="MenuItem A"> 
                                                  <menuitem label="SubMenuItem A-1" type="check" toggled="true"/> 
                                                  <menuitem type="separator"/>      
                                                  <menuitem label="SubMenuItem A-2"/> 
                                                  <menuitem label="SubMenuItem A-3"> 
                                                            <menuitem label="Sub-SubMenuItem A-3-1"/> 
                                                            <menuitem label="Sub-SubMenuItem A-3-2" enabled="false"/> 
                                                            <menuitem label="Sub-SubMenuItem A-3-3"/> 
                                                  </menuitem> 
                                        </menuitem> 
                                        <menuitem label="MenuItemB"> 
                                                  <menuitem label="SubMenuItem B-1"/> 
                                                  <menuitem label="SubMenuItem B-2"/> 
                                        </menuitem> 
                              </root> 
  </fx:XML> 
                    <mx:FlexNativeMenu id="testMenu" dataProvider="{menuData}" labelField="@label" showRoot="false"/>
  </fx:Declarations>
</s:WindowedApplication>

However, every time I'm running the debugger, the same issue appears (something related to dataDescriptor):

[SWF] testmenu.swf - 1,700,179 bytes after decompression
ReferenceError: Error #1065: Variable mx.controls.treeClasses::DefaultDataDescriptor is not defined.
          at mx.controls::FlexNativeMenu()
          at testmenu/_testmenu_FlexNativeMenu1_i()
          at testmenu()[/Users/Minopharma/Documents/Adobe Flash Builder 4.6/testmenu/src/testmenu.mxml:5]
          at _testmenu_mx_managers_SystemManager/create()[_testmenu_mx_managers_SystemManager.as:51]
          at mx.managers.systemClasses::ChildManager/initializeTopLevelWindow()
          at mx.managers::SystemManager/initializeTopLevelWindow()
          at mx.managers::SystemManager/http://www.adobe.com/2006/flex/mx/internal::kickOff()
          at mx.managers::SystemManager/http://www.adobe.com/2006/flex/mx/internal::preloader_completeHandler()
          at flash.events::EventDispatcher/dispatchEventFunction()
          at flash.events::EventDispatcher/dispatchEvent()
          at mx.preloaders::Preloader/timerHandler()
          at flash.utils::Timer/_timerDispatch()
          at flash.utils::Timer/tick()

Interestingly, when tried to debug the same mxml code above by using air sdk 3.1 (flex 4.6.0 +air sdk 3.1), everything is displaying normal...

I really don't understand where is the problem? Is it something new/changed in air sdk 3.9 comparing to 3.1 (regarding the same menu component) or is it a bug?

I would really appreciate any help in solving this issue...

Regards,

Nikola