diff -r 859804c78010 -r 04efef2a9c1e rt/launcher/src/main/java/org/apidesign/bck2brwsr/launcher/impl/JVMBridge.java
--- a/rt/launcher/src/main/java/org/apidesign/bck2brwsr/launcher/impl/JVMBridge.java	Thu Mar 14 09:22:28 2013 +0100
+++ b/rt/launcher/src/main/java/org/apidesign/bck2brwsr/launcher/impl/JVMBridge.java	Wed Apr 17 17:04:40 2013 +0200
@@ -17,17 +17,35 @@
  */
 package org.apidesign.bck2brwsr.launcher.impl;
 
+import java.util.TooManyListenersException;
+import javafx.beans.value.ChangeListener;
+
 /**
  *
  * @author Jaroslav Tulach <jtulach@netbeans.org>
  */
 public final class JVMBridge {
     private static ClassLoader[] ldrs;
+    private static ChangeListener<Void> onBck2BrwsrLoad;
         
     public static void registerClassLoaders(ClassLoader[] loaders) {
         ldrs = loaders.clone();
     }
     
+    public static void addBck2BrwsrLoad(ChangeListener<Void> l) throws TooManyListenersException {
+        if (onBck2BrwsrLoad != null) {
+            throw new TooManyListenersException();
+        }
+        onBck2BrwsrLoad = l;
+    }
+
+    public static void onBck2BrwsrLoad() {
+        ChangeListener<Void> l = onBck2BrwsrLoad;
+        if (l != null) {
+            l.changed(null, null, null);
+        }
+    }
+    
     public Class<?> loadClass(String name) throws ClassNotFoundException {
         System.err.println("trying to load " + name);
         ClassNotFoundException ex = null;