QSystemTrayIcon closes my complete application

[NoRulez]

Hey @all,

I'Ve an application with an system tray icon. When the application is hidden and i open and close a dialog from the context menu of the tray icon, then the complete application is closed.

Here is how i open the preference dialog for example:

Preferences *pPreferences = new Preferences(this);
if(pPreferences) {
     pPreferences->setAttribute(Qt::WA_DeleteOnClose);
     pPreferences->exec();
}

Preferences *pPreferences = new Preferences(this);
if(pPreferences) {
     pPreferences->setAttribute(Qt::WA_DeleteOnClose);
     pPreferences->exec();
}

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and in the preference dialog I've the following to close it, if the button "Close" was pressed:

connect(m_ui->btnClose, SIGNAL(clicked()), this, SLOT(close()));

connect(m_ui->btnClose, SIGNAL(clicked()), this, SLOT(close()));

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So, when I press the "Close" button from the preference dialog, then the complete application is closed. The tray icon is gone when i move the mouse cursor over it.

I hope someone could help me please

Best Regards
NoRulez