Drag and drop not working on Mac

By testing my extension in a Mac I noticed that drag and drop doesn't work as expected. Therefore I have created a new simple extension with only one list and a simple data provider:
  [Bindable]
  public var aData:ArrayCollection = new ArrayCollection(['one','two','three','four']);
            <s:List dataProvider="{aData}" dragEnabled="true" dropEnabled="true" dragMoveEnabled="true"> </s:List>
this should allow the user to reorder the items in the list by dragging them.
It works fine in Windows as extension for Photoshop CS6 and also in Mac as AIR application but it doesn't works as Photoshop CS6 extension in Mac (Lion); I can neither see the drop line between items.
Is this a known problem and which is the workaround ?
Thanks

I hope someone can help me, I'm really desperate on this as I can't find a solution
Native drag and drop works but no others, have tested in Lion and Mountain Lion. Can't drag elements in a list to reorder them and can't drag between lists.
It seems the only event fired is dragcomplete, the drag indicator is not shown but I can skin the dragged item.
Have tried adding manual drag-drop control ( http://livedocs.adobe.com/flex/3/html/help.html?content=dragdrop_5.html ) without luck
Any help or workaround would be appreciated.

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