[Solved] How can I change default expand/collapse sub-items in QTreeWidget?

[LeeMinh]

I tried to create a simple treeview with the following code with Qt 4.8

@
QTreeWidgetItem *city = new QTreeWidgetItem(ui->trvCompetitions);
city->setText(0, tr("City"));

(new QTreeWidgetItem(city))->setText(0, tr("Stockholm"));
(new QTreeWidgetItem(city))->setText(0, tr("Helsinki"));
(new QTreeWidgetItem(city))->setText(0, tr("Copenhagen"));

QTreeWidgetItem *other = new QTreeWidgetItem(ui->trvCompetitions);
other->setText(0, tr("Other"));

(new QTreeWidgetItem(other))->setText(0, tr("London"));
(new QTreeWidgetItem(other))->setText(0, tr("Tokio"));
(new QTreeWidgetItem(other))->setText(0, tr("Hanoi"));

@

And this is the treeview I got

!http://i249.photobucket.com/albums/gg220/HienBoo/tree_view_1.png(myTreeView)!

I have read "this article":http://qt-project.org/doc/qt-4.8/itemviews-simpletreemodel.html and I only want my treeview has expand/collapse sub-items like that

!http://qt-project.org/doc/qt-4.8/images/simpletreemodel-example.png(The TreeView I want to get)!

How can I change my treeview like this?

Thank!

[butterface]

http://qt-project.org/doc/qt-4.8/stylesheet-examples.html#customizing-qtreeview

[LeeMinh]

Oh, thanks for your reponse! It is useful for me.
[quote author="butterface" date="1375969446"]http://qt-project.org/doc/qt-4.8/stylesheet-examples.html#customizing-qtreeview[/quote]