public List<BufferedImage> getExamples() {
   if (exampleField != null) {
     return exampleField.getExamples();
   } else {
     return null;
   }
 }
 public void addExamples(List<BufferedImage> examples) {
   if (exampleField != null) {
     exampleField.addExamples(examples);
   }
 }