onBrowserEvent change Cell colour

Dear GWT Users,

Thanks in advance for help.  Ive searched the mail archives and had a good google, but cant find what im after.

I'd like to change the colour of my Cell when the user rolls over it.  I thought it would be as simple as saving a class level / scope variable of SafeHtmlBuilder (when redner is called) and appending to it when onBrowserEvent is executed - but that doesnt seem to work.

public void onBrowserEvent(Context context, Element parent, Track value, NativeEvent event, ValueUpdater<Track> valueUpdater) {
 
    super.onBrowserEvent(context, parent, value, event, valueUpdater);
    if("mouseover".equals(event.getType())) {
// change colour

public void render(Context context, Track track, SafeHtmlBuilder safeHtmlBuilder) {
    if (track != null) {
        safeHtmlBuilder.append(template.showTrack("images/someImg.png",track.getName()));
    }
}

Regards, Sam

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