public BooleanToggleButtonManager(Preferences prNode, String prefName, boolean def) {
// Chop of classname and last package component for logger.
String p = getClass().getName();
int idx = p.lastIndexOf('.');
p = p.substring(0, idx);
idx = p.lastIndexOf('.');
p = p.substring(0, idx);
log = Logger.getLogger(p + "." + prefName.replace('/', '.'));
this.def = def;
pr = prNode;
pref = prefName;
}
