Undisplayed tabstrip tabs disable the editor

[David Bailey]

Upon rendering, the selected node's editor works just fine but the ajax rendered version is disabled and throws a javascript error in the console that telerik.editor.min.js errored with a message of

　'contentWindow' is null or not an object

Here is the code I changed from the sample (as uploaded):

<% Html.Telerik().TabStrip()
   .Name("tsParent")
   .Items(parent =>
   {
       parent.Add()
            .Text("Parent")
            .LoadContentFrom("ViewChildUserControl", "Home")
            .Selected(true);
       parent.Add()
            .Text("NewTab")
            .LoadContentFrom("ViewChildUserControl", "Home");
   })
   .Render();
%>