code: private Icon getEnabledIcon(AbstractButton b, Icon defaultIcon) {
          if (defaultIcon == null) {
              defaultIcon = getSynthIcon(b, SynthConstants.ENABLED);
          }
  
          return defaultIcon;
      }
docs: DOCUMENT ME!
  
  @param  b           DOCUMENT ME!
  @param  defaultIcon DOCUMENT ME!
  
  @return DOCUMENT ME!