/**
* watch the historyTokens after the querystring#historyToken or you could say
* querystring#[historyEvent|applicationState]
*/
private void initHistoryObservations() {
History.addValueChangeHandler(this);
// first load
Track.track("home");
}
public void onValueChange(ValueChangeEvent<String> event) {
// get the querystring token
String historyToken = History.getToken();
// send to static method that will send the __utm.gif to google's server fro tracking
Track.track(historyToken);
}