public void onMenuButtonPressed(MenuButtonPressedEvent event) {
menuButtonEventSource.fire(new MenuButtonEvent());
}
});
event.getStartCallButtonHandler().addStartCallButtonHandler(new StartCallButtonPressedHandler() {
@Override
public void onStartCallButtonPressed(StartCallButtonPressedEvent event) {
startCallButtonEventSource.fire(new StartCallButtonEvent());
}
});