 <p>This is the solution, I didn't change anything in the original code and script:</p> <pre><code>&lt;div id="content"&gt; &lt;div id="tab1"&gt;@{ Html.RenderAction("TabbedIndex", "Stuff", new { claimed = false }); }&lt;/div&gt; &lt;div id="tab2"&gt;@{ Html.RenderAction("TabbedIndex", "Stuff", new { claimed = true }); }&lt;/div&gt; &lt;/div&gt; </code></pre>