system tray message is not displaying near tary icon

[sudhansu]

HI All
Here is my class for systemtray icon


class MySystemTrayMessages : public QSystemTrayIcon
{
public:
MySystemTrayMessages() {ptrTrayIcon = new QSystemTrayIcon;}
QSystemTrayIcon *m_ptrTrayIcon;
DisplayMessage(QString str);
}

DisplayMessage(QString str)
{
m_ptrTrayIcon->showMessage(str, str, icon,
100000);
}

But if i call DisplayMessage from mainwindow class constructor, its displaying the bubble message in the center of my monitor.

But it should display near to the trayicon. How to solve it???