XBindTrial.fx

import org.jfxtras.lang.XBind;

import javafx.stage.*;
import javafx.scene.*;
import javafx.scene.layout.HBox;
import javafx.scene.control.*;

function run():Void {
  try {
    
    def lab = Label { text: "->" };
    def ctx = javafx.reflect.FXLocal.getContext();
    def labMirror = ctx.mirrorOf(lab);

    def x = XBind.bindTo(labMirror, labMirror.getType().getVariable("text"));

    // if i comment this label out then the listener is not called
    Label { text: bind x.ref as String; }   

    x.addListener(function(x:Object, y:Object):Void { Alert.inform("changed") });

    Stage {
      scene: Scene {
        content: HBox {
          content: [
            Button { 
              text: "->"
              action: function():Void {
                lab.text = "{lab.text} ->";
              }
            },
            lab          
          ]   
        }
      }
    }
  } catch (x: java.lang.Exception) {
    Alert.inform("{x}");
  }
}