QTreeWidget expand button style

[nxMan]

https://forum.qt.io/topic/32120/qtreewidget-expand-button-style How can I solve the problem described in this thread without using stylesheet?

[raven-worx]

@nxMan
i haven't tried it, but you can try it ;)
Use QStyleFactory to create an older Windows style and set it on the widget.

QStyle * style = QStyleFactory::create("..."); //check QStyleFactory::keys() for possible values
treeWidget->setStyle( style );