@Override
 public Object convert(CSSValue value, CSSEngine engine, Object context) throws Exception {
   Display display = (Display) context;
   return CSSSWTImageHelper.getImage(value, engine.getResourcesLocatorManager(), display);
 }
 @Override
 public void reset() {
   CSSSWTImageHelper.restoreDefaultImage(getToolItem());
   super.reset();
 }