Registering for event

Hi,

I am embedding xulrunner in java.

I will be launching new window with the given URL and will get
performance metrics like time for rendering, document complete. There
will be lot of new window will be open up.

I want to get notified for "MozAfterPaint", "DomContentLoaded" and
"Load" event on a window.

To get notified for the above events, i registered listener when
window is opened (listening to
nsIWindowMediatorListener.onOpenWindow). But i got notified for
about:blank which is given while launching the window and it is
notified only once.

I will be loading the required URL through nsIWebNavigation.loadURI.
For which i never received any event.

Am i doing anything wrong ?

Please help.

Raghavan