Mac OSX exec() on a dialog with Qt::Tool windowflag is just a dialog.

On OSX 10.4:
Calling exec() on a subclass of QDialog modified with setWindowFlags( Qt::Tool ) results in a normal dialog, as in the following example. Calling show() results in the tool windows as expected.

#include <QtGui>
class AboutDialog : public QDialog
{
Q_OBJECT

public:
AboutDialog(QWidget *parent = 0) : QDialog(parent)

{ setWindowFlags( Qt::Tool ); setWindowTitle("Tool dialog"); }

};

#include "main.moc"

int main(int argc, char *argv[])
{
QApplication app(argc, argv);
AboutDialog *myDia = new AboutDialog();
myDia->exec();
// myDia->show();
return app.exec();
}