public void setLinearStripes(LinearStripe ls) {
    if (ls == null) {
      linearStripesAppender.removeAll();
      return;
    }

    this.linearStripesAppender.add(ls);
  }
 public void setLinearGradient(LinearGradient lg) {
   if (lg == null) {
     linearGradientAppender.removeAll();
     return;
   } else {
     this.linearGradientAppender.add(lg);
   }
 }
 public void removeLinearStripes() {
   linearStripesAppender.removeAll();
 }
 public void removeLinearGradient() {
   linearGradientAppender.removeAll();
 }