title: Html.RenderPartial and Ajax.BeginForm -> Submit is called twice
body: <p>I have the following index view:</p>
  
  <pre><code>@model BoringStore.ViewModels.ProductIndexViewModel
  @{
      ViewBag.Title = "Index";
  }
  
  &lt;h2&gt;Produkte&lt;/h2&gt;
  
  &lt;div id='addProduct'&gt;
      @{ Html.RenderPartial("Create", new BoringStore.Models.Product()); }
  &lt;/div&gt;
  
  &lt;div id='productList'&gt;
      @{ Html.RenderPartial("ProductListControl", Model.Products); }
  &lt;/div&gt;
  </code></pre>
  
  <p>The "productList" is just a list of all products.</p>
  
  <p>The addProduct renders my Create View:</p>
  
  <pre><code>&lt;script src="@Url.Content("~/Scripts/jquery.unobtrusive-ajax.min.js")" type="text/javascript"&gt;&lt;/script&gt;
  &lt;div id="dialog-confirm" title="Produkt hinzufügen" style="display:none"&gt;
  @using (Ajax.BeginForm("Index_AddItem", new AjaxOptions { UpdateTargetId = "productList" }))
  { 
      @Html.Raw(DateTime.Now.ToString());
  
      &lt;div&gt;
          @Html.LabelFor(model =&gt; model.Name)
          @Html.EditorFor(model =&gt; model.Name)
      &lt;/div&gt;
      &lt;br /&gt;
      &lt;div&gt;
          @Html.LabelFor(model =&gt; model.Price)
          @Html.EditorFor(model =&gt; model.Price)
      &lt;/div&gt;
      &lt;br /&gt;&lt;br /&gt;
      &lt;div&gt;
          &lt;input type="submit" value="Produkt hinzufügen" /&gt;
      &lt;/div&gt;
  }
  </code></pre>
  
  <p></p>
  
  <p>When submitting the form, the Index_AddItem-method in my controller is called. Unfortunately the form always calls the method twice. :(</p>
  
  <p>Can someone help me out?</p>