extraLoader = new URLClassLoader(new URL[] { url }, contextLoader);
RegistryBuilder builder = new RegistryBuilder(extraLoader);
builder.add(TapestryModule.class);
registry = builder.build();
source = registry.getService(ComponentInstantiatorSource.class);
access = registry.getService(PropertyAccess.class);
source.addPackage("org.apache.tapestry5.internal.transform.pages");