next.setEnabled(false);
vc = new VolumeControl(5);
vc.setStyleName(imgPack.volume());
vc.setPopupStyleName(STYLE_NAME + "-volumeControl");
vc.addVolumeChangeHandler(new VolumeChangeHandler() {
@Override
public void onVolumeChanged(VolumeChangeEvent event) {
player.setVolume(event.getNewVolume());
}