Mac OS X: QMenu steals all mouse press events while it is open

#include <QtGui>

class MyMenu : public QMenu {
public:
	MyMenu(QWidget *parent=0) : QMenu(parent) {}
protected:
	void mousePressEvent(QMouseEvent *e) {
		qDebug("MyMenu mouse press");
		QMenu::mousePressEvent(e);
	}
};

class MyWidget : public QWidget {
protected:
	void mousePressEvent(QMouseEvent *e) {
		qDebug("MyWidget mouse press");
		QWidget::mousePressEvent(e);
	}
	void contextMenuEvent(QContextMenuEvent *e) {
		MyMenu menu(this);
		menu.addAction("foo");
		menu.exec(e->globalPos());
	}
};

int main(int argc, char *argv[]) {
    QApplication a(argc, argv);
    MyWidget w;
    w.show();
    return a.exec();
}