firePropertyChange(HEADER_VALUE_PROPERTY, oldValue, headerValue);
changeSupport.firePropertyChange(HEADER_VALUE_PROPERTY, oldValue, headerValue);
  public void setHeaderValue(Object headerValue)  {    if (this.headerValue == headerValue)      return;        Object oldValue = this.headerValue;    this.headerValue = headerValue;    firePropertyChange(HEADER_VALUE_PROPERTY, oldValue, headerValue);  }