diff -r bb1e59f5cff3 -r 6193e735f4d1 rt/vm/src/main/java/org/apidesign/vm4brwsr/VM.java
--- a/rt/vm/src/main/java/org/apidesign/vm4brwsr/VM.java	Sat Oct 05 07:23:48 2013 +0200
+++ b/rt/vm/src/main/java/org/apidesign/vm4brwsr/VM.java	Fri Oct 11 09:58:03 2013 +0200
@@ -80,6 +80,7 @@
                 }
                 InputStream is = loadClass(l, name);
                 if (is == null) {
+                    lazyReference(out, name);
                     skipClass.add(name);
                     continue;
                 }
@@ -250,4 +251,16 @@
     String getVMObject() {
         return "vm";
     }
+    
+    private static void lazyReference(Appendable out, String n) throws IOException {
+        String cls = n.replace('/', '_');
+        String dot = n.replace('/', '.');
+        
+        out.append("\nvm.").append(cls).append(" = function() {");
+        out.append("\n  var instance = arguments.length == 0 || arguments[0] === true;");
+        out.append("\n  delete vm.").append(cls).append(";");
+        out.append("\n  var c = vm.loadClass('").append(dot).append("');");
+        out.append("\n  return vm.").append(cls).append("(instance);");
+        out.append("\n}");
+    }
 }