code: public boolean isBound()
      {
          //
          // Constrained properties are implicitly bound.  Refer to section 7.4.3 of the JavaBeans
          // spec for the rationale.
          //
          PropertyInfo propInfo = getPropertyInfo();
          return propInfo != null && (propInfo.bound() || propInfo.constrained());
      }
docs: Returns 'true' is the property is a bound property that will support registration of
  a PropertyChangeListener for change notifications.