protected final void fireVetoableChange(PropertyChangeEvent evt) throws PropertyVetoException {
  vcs.fireVetoableChange(evt);
}

protected final void fireVetoableChange ( PropertyChangeEvent evt ) throws PropertyVetoException { vcs . fireVetoableChange ( evt ) ; }
fire a vetoable property update to any registered listeners . if anyone vetos the change , then fire a new event reverting everyone to the old value and then rethrow the propertyvetoexception . < p > no event is fired if old and new are equal and non - null .
