How to show Multiple Message using QSystemTrayIcon?

[ashukla]

foreach (QString str, msgData) {
		QSystemTrayIcon::MessageIcon icon = QSystemTrayIcon::MessageIcon();
		this->showMessage(tr("Alert"), str, icon);
		sleep(2);
	}

foreach (QString str, msgData) {
		QSystemTrayIcon::MessageIcon icon = QSystemTrayIcon::MessageIcon();
		this->showMessage(tr("Alert"), str, icon);
		sleep(2);
	}

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The above code doesn't display all the message. Only the last alert is visible. How to display all the alerts.