diff -r 8d6534b67252 -r 04efef2a9c1e rt/launcher/src/main/java/org/apidesign/bck2brwsr/launcher/impl/FXBrwsr.java
--- a/rt/launcher/src/main/java/org/apidesign/bck2brwsr/launcher/impl/FXBrwsr.java	Wed Mar 20 08:48:06 2013 +0100
+++ b/rt/launcher/src/main/java/org/apidesign/bck2brwsr/launcher/impl/FXBrwsr.java	Wed Apr 17 17:04:40 2013 +0200
@@ -18,9 +18,11 @@
 package org.apidesign.bck2brwsr.launcher.impl;
 
 import java.util.List;
+import java.util.TooManyListenersException;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 import javafx.application.Application;
+import javafx.application.Platform;
 import javafx.beans.value.ChangeListener;
 import javafx.beans.value.ObservableValue;
 import javafx.event.ActionEvent;
@@ -32,7 +34,6 @@
 import javafx.scene.Node;
 import javafx.scene.Scene;
 import javafx.scene.control.Button;
-import javafx.scene.control.TextField;
 import javafx.scene.layout.ColumnConstraints;
 import javafx.scene.layout.GridPane;
 import javafx.scene.layout.Pane;
@@ -77,6 +78,12 @@
             view.setPrefSize(500, 400);
             final WebEngine eng = view.getEngine();
             LOG.log(Level.FINE, "params : {0}", params);
+            try {
+                JVMBridge.addBck2BrwsrLoad(new InitBck2Brwsr(eng));
+            } catch (TooManyListenersException ex) {
+                LOG.log(Level.SEVERE, null, ex);
+            }
+            
             if (params.size() > 0) {
                 LOG.log(Level.FINE, "loading page {0}", params.get(0));
                 eng.load(params.get(0));
@@ -85,12 +92,6 @@
             eng.setOnAlert(new EventHandler<WebEvent<String>>() {
                 @Override
                 public void handle(WebEvent<String> t) {
-                    if ("bck2brwsr".equals(t.getData())) { // NOI18N
-                        if (initBck2Brwsr(eng)) {
-                            // ignore initial message
-                            return;
-                        }
-                    }
                     final Stage dialogStage = new Stage();
                     dialogStage.initModality(Modality.WINDOW_MODAL);
                     dialogStage.setTitle("Warning");
@@ -152,6 +153,30 @@
                 layoutInArea(child, left, top, width - left - right, height - top - bottom, 0, Insets.EMPTY, true, true, HPos.CENTER, VPos.CENTER);
             }
         }
+
+        private class InitBck2Brwsr implements ChangeListener<Void>, Runnable {
+            private final WebEngine eng;
+
+            public InitBck2Brwsr(WebEngine eng) {
+                this.eng = eng;
+            }
+
+            @Override
+            public synchronized void changed(ObservableValue<? extends Void> ov, Void t, Void t1) {
+                Platform.runLater(this);
+                try {
+                    wait();
+                } catch (InterruptedException ex) {
+                    LOG.log(Level.SEVERE, null, ex);
+                }
+            }
+
+            @Override
+            public synchronized void run() {
+                initBck2Brwsr(eng);
+                notifyAll();
+            }
+        }
     }
     
 }