Handle escape key event on PopupPanel GWT 2.5.1

Hi everyone...i have a problem with handling the escape key event.

I have a popup panel and i want to intercept the keydown event when the escape button is pressed.

I override the "onPreviewNativeEvent" in order to manage the event (i want to hide the panel)

This is the snippet code

        @Override

protected void onPreviewNativeEvent(NativePreviewEvent event) {

int type = event.getTypeInt();

if (!event.isCanceled()) {

if (type == Event.ONKEYDOWN) {

int keyCode = event.getNativeEvent().getKeyCode();

// ESC clicked

if (keyCode == KeyCodes.KEY_ESCAPE) {

hide();

} 

}

}

super.onPreviewNativeEvent(event);

}

But it seems that nothing works when i hit the button on the keyboard (only for the escape button. If i press another button the event is intercepted and everything works very well)

I can't understand where is the problem.

My application works on Internet Explorer 10 (and it must work only for Microsoft's browsers)

Thank you

Ale 

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