Echo Web Framework

I want to regester a listener on a TextFiled,the listener can listen to the action when I type any letter in the TextField,So I use this code,it works ok
TextField field = new TextField();
field.set(TextComponentPeer.PROPERTY_SYNC_MODE,
TextComponentPeer.SYNC_ON_CHANGE);
field.set(TextComponentPeer.PROPERTY_SYNC_DELAY, new Integer(0));
field.addPropertyChangeListener(TextField.TEXT_CHANGED_PROPERTY,
new PropertyChangeListener() {

@Override
public void propertyChange(PropertyChangeEvent evt) {
System.out.println("ok");
}
});

but I found only nextapp.echo.app.TextField and nextapp.echo.app.PsswordField works well,the TextField in echopoint,such as RegexTextField doesn't work,why?!