http://bugs.winehq.org/show_bug.cgi?id=27984
--- Comment #1 from Nikolay Sivov bunglehead@gmail.com 2011-08-05 20:09:02 CDT --- Created an attachment (id=35826) --> (http://bugs.winehq.org/attachment.cgi?id=35826) patch
Try this one. If I got it right application customize edit box text so it's not the same as item text when edit displayed. I fixed similar thing for Listview some months ago, Treeview should act similar apparently.