diff -r e8916518b38d -r 9cc253aa9405 javaquery/api/src/test/java/org/apidesign/bck2brwsr/htmlpage/KnockoutTest.java
--- a/javaquery/api/src/test/java/org/apidesign/bck2brwsr/htmlpage/KnockoutTest.java	Thu Apr 04 13:08:26 2013 +0200
+++ b/javaquery/api/src/test/java/org/apidesign/bck2brwsr/htmlpage/KnockoutTest.java	Thu Apr 18 16:58:55 2013 +0200
@@ -18,6 +18,8 @@
 package org.apidesign.bck2brwsr.htmlpage;
 
 import java.util.List;
+import javafx.scene.web.WebEngine;
+import netscape.javascript.JSObject;
 import org.apidesign.bck2brwsr.core.JavaScriptBody;
 import org.apidesign.bck2brwsr.htmlpage.api.ComputedProperty;
 import org.apidesign.bck2brwsr.htmlpage.api.OnEvent;
@@ -39,7 +41,7 @@
     @Property(name="name", type=String.class),
     @Property(name="results", type=String.class, array = true),
     @Property(name="callbackCount", type=int.class),
-    @Property(name="people", type=PersonImpl.class, array = true)
+    @Property(name="people", type=Person.class, array = true)
 }) 
 public class KnockoutTest {
     
@@ -234,25 +236,53 @@
         return VMTest.create(KnockoutTest.class);
     }
     
-    @JavaScriptBody(args = { "id" }, body = 
+    private static final String COUNT_CHILDREN = 
           "var e = window.document.getElementById(id);\n "
         + "if (typeof e === 'undefined') return -2;\n "
-        + "return e.children.length;\n "
-    )
-    private static native int countChildren(String id);
+        + "return e.children.length;\n";
+    @JavaScriptBody(args = { "id" }, body = COUNT_CHILDREN)
+    private static int countChildren(String id) {
+        return ((Number)js().call("countChildren", id)).intValue();
+    }
 
-    @JavaScriptBody(args = { "id", "pos" }, body = 
+    private static final String TRIGGER_CHILD_CLICK = 
           "var e = window.document.getElementById(id);\n "
         + "var ev = window.document.createEvent('MouseEvents');\n "
         + "ev.initMouseEvent('click', true, false, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null);\n "
-        + "e.children[pos].dispatchEvent(ev);\n "
-    )
-    private static native void triggerChildClick(String id, int pos);
+        + "e.children[pos].dispatchEvent(ev);\n ";
+    @JavaScriptBody(args = { "id", "pos" }, body = TRIGGER_CHILD_CLICK)
+    private static void triggerChildClick(String id, int pos) {
+        js().call("triggerChildClick", id, pos);
+    }
 
-    @JavaScriptBody(args = { "id", "pos" }, body = 
+    private static final String CHILD_TEXT = 
           "var e = window.document.getElementById(id);\n "
         + "var t = e.children[pos].innerHTML;\n "
-        + "return t ? t : null;"
-    )
-    private static native String childText(String id, int pos);
+        + "return t ? t : null;";
+    @JavaScriptBody(args = { "id", "pos" }, body = CHILD_TEXT)
+    private static String childText(String id, int pos) {
+        return (String) js().call("childText", id, pos);
+    }
+    
+    
+    private static JSObject js;
+    private static JSObject js() {
+        if (js == null) {
+            WebEngine eng = (WebEngine)System.getProperties().get("webEngine");
+            if (eng == null) {
+                js = null;
+            } else {
+                js = (JSObject) eng.executeScript("(function () {" +
+                    "var obj = {};"
+                    + ""
+                    + "obj.countChildren = function(id) { " + COUNT_CHILDREN + "};"
+                    + "obj.triggerChildClick = function(id, pos) { " + TRIGGER_CHILD_CLICK + "};"
+                    + "obj.childText = function(id, pos) { " + CHILD_TEXT + "};"
+                    + "return obj;"
+                + "})();");
+            }
+        }
+
+        return js;
+    }
 }