QTreeWidget控件能有关闭按钮么？

[hyzable]

使用了ui->treeWidget->setWindowFlags(Qt::WindowCloseButtonHint);还是没有显示关闭的按钮出来。

[LubinLew]

//disable Close (“X”) button
setWindowFlags(Qt::Window | Qt::WindowMinimizeButtonHint | Qt::WindowMaximizeButtonHint);
//enable Close (“X”) button
setWindowFlags(Qt::Window| Qt::WindowMinimizeButtonHint| Qt::WindowMaximizeButtonHint | Qt::WindowCloseButtonHint);