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    <p>After another look at the linked article, I believe the quoted text refers to marshalling operations on a managed object that take place after it has been created by <code>createObject</code> or <code>createManagedObject</code>. </p> <p>So a class like this:</p> <pre><code>[ScriptableType] public class TestClass { public object arrayObj; public object dicObj; public TestClass sibling; public TestClass(){} public void testMethod(TestClass testClassObj) { //Assuming argument came from Javascript //&amp; arrayObj and dicObj were assigned an //Array and dictionary-obj respectively testClassObj.arrayObj; //Formal type: Object. Actual type: object[] testClassObj.dicObj; //Formal type: Object. Actual type: // Dictionary&lt;string, object&gt; } } </code></pre> <p>Utilized by the Silverlight application like this:</p> <pre><code>private void Application_Startup(object sender, StartupEventArgs e) { this.RootVisual = new MainPage(); HtmlPage.RegisterCreatableType("TestClass", typeof(TestClass)); HtmlPage.RegisterScriptableObject("scripTestClassObj", new TestClass()); } </code></pre> <p>Can be used like this on the client-side:</p> <pre><code>var testClassObj = silverlight_domElement.content .services.CreateObject("TestClass"); testClassObj.arrayObj = [1,2,3]; testClassObj.dicObj = {key: 1}; silverlight_domElement.content.scripTestClassObj.testMethod(testClassObj); //"sibling"'s arrayObj and dicObj types will have actual types //of object[] and Dictionary&lt;string, object&gt; respectively silverlight_domElement.content.scripTestClassObj.sibling = testClassObj; </code></pre> <p>In other words, it has no bearing on the functionality in discussion.</p> <p>In the context of my question, it means that passing non-primitive Javascript values to managed code requires adherence to one of the following guidelines:</p> <ol> <li>The type of the target property or method parameter must be <code>ScriptObject</code> (or <code>Object</code>, since that is the class it derives from).</li> <li>The type of the target property or method parameter must either be explicitly or implicitly registered with HtmlPage.RegisterCreatableType, and the value passed must be the object resulting from a <code>createObject</code> or <code>createManagedObject</code> call with the registered alias (<code>createObject</code>) or type (<code>createManagedObject</code>).</li> </ol> <p>Please feel free to correct me if any of the statements I've made are incorrect.</p>
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