protected final void fireVetoableChange(String propertyName,Object oldValue,Object newValue) throws PropertyVetoException {
  vcs.fireVetoableChange(propertyName,oldValue,newValue);
}

protected final void fireVetoableChange ( String propertyName , Object oldValue , Object newValue ) throws PropertyVetoException { vcs . fireVetoableChange ( propertyName , oldValue , newValue ) ; }
report 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 .
