I've searched many times here in the forum and on the net, and aparently I cant apply a transparent background, only to the whole app. of course the posts were outdated, but..
Where can I find Qt::WA_TranslucentBackground documentation? Its not in QtCreator Help. And does it really work?

@wysota: You can make the background of your listview transparent (if your system supports it)
Im using Win Vista. Is there any cross platform way? Thanks again.