TGListTree

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I have a TGListTree, and I would like to be able to change the little
close/open icon based
on some value of my user data of the TGListTreeItem.
As there's no TGListTreeItem::SetOpenPicture or SetClosePicture, I
tried to add (AddItem) again the same
item with different pictures, but as the user data is the same, the
AddItem does not add actually.
How can I achieve my goal ?

Thanks

-- 
APHECETCHE Laurent (mailto:Laurent.Aphecetche@subatech.in2p3.fr)       
SUBATECH-Ecole des Mines de Nantes-4 rue Alfred Kastler-44070 NANTES
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