Show maximize button in the title bar of a QDialog under GNOME

Hello!

I need to show the maximize (and minimize) buttons in the title bar of a QDialog. I made this:
Code:

dialog->setWindowFlags(dialog->windowFlags() | Qt::WindowMinMaxButtonsHint);
which I call for the QDialog* dialog.

Under KDE and Windows, the min max buttons are shown and working. Under GNOME, the buttons are not shown (I only see the close button).

How can I solve this? Is it safe to do:
Code:

dialog->setWindowFlags(Qt::WindowMinMaxButtonsHint | Qt::WindowCloseButtonHint);
(this works, practically, under GNOME)

so that the flags for this dialog will not contain Qt::Dialog anymore, but will contain Qt::Window?

I tried also setting Qt::CustomizeWindowHint under GNOME, but it does not work.

I also found this link to a similar problem: http://www.archivum.info/qt-interest...-Metacity.html

Thank you!