QTreeView: drawing background rect for items in selected state

Qt: 4.7
OS: Windows XP

I need a QTreeView that will be look like this:
Attachment 5417
(Blue background of selected items is depend from leght of text and have not gaps between siblings.)

But standart behaivor of QtreeView with setuped QAbstractItemView::SelectItems flag look like this:
Attachment 5418
(it's have ugly white gaps beetwen siblings)

Maybe anybody has same problem with QTreeView like me, and can make for me a little suggestion ?

Using custom Delegate is bad idea, because tree must have maximally native view on different windows'es (xp, vista, 7, (+ classic theme)).

Maybe it can be do by some stylesheet ? I could not do it :(.


P.S. Please excuse my poor english.