How to popup a notification panel in Xul without taking focus from the current window?

I woul开发者_如何学Cd like to popup a notification window in front of any window, but without take focus, like a messenger notifications..

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Check these out:

https://developer.mozilla.org/en/XUL/PopupGuide/Floating_Panels

https://developer.mozilla.org/en/XUL/PopupGuide/Panels