private class AtrasButtonListener implements ComponentListener {
@Override
public void componentActivated(final AbstractComponent source) {
if (DataManager.getLastState() == 0) {
stateBasedGame.enterState(0, new FadeOutTransition(), new FadeInTransition());
} else {
stateBasedGame.enterState(3, new FadeOutTransition(), new FadeInTransition());
}
}