Urgent: Window.addWindowClosingHandler doesn't work on IE8?

[Jianjun Wen]

Hi I tried to use it like this:

 Window.addWindowClosingHandler(new Window.ClosingHandler() {
public void onWindowClosing(Window.ClosingEvent event) {
event.setMessage(my messgae);
}
  });

It works on Chrome and FF.
But on IE8, if clicking on cancel button on the popup causes error.

Any workaround?

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gwt.i18n.client.Messages

[jianjun]

I'm using the Messages.
What's the rule(s) to modify an existed Message? Will the translator
pick it up?
thanks,

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