Loading IFrame with external URL in Ext.NET

Question

I create a Window in my Ext.NET desktop. My Window definition is:

var window = new Window
{
   ID = "MyID",
   Title = "Window Title", 
   MinWidth = 600,
   MinHeight = 400,
   CloseAction = CloseAction.Destroy,
   Loader = new ComponentLoader
   {
       Url = "http://www.google.com",
       Mode = LoadMode.Frame,
       LoadMask = { ShowMask = true }
   }
};

and this is added to a new DesktopModule. The code for this is:

public static DesktopModule Create(MyModel model)
{
    var module = DesktopModuleHelper.CreateModule(new ModuleProperties
    {
        Id = "MyId",
        Index = 6,
        Model = model,
        Cls = "x-app-myapp"
    });

    window.IconCls = "x-app-sm x-app-myapp";
    module.Window.Add(window);

    return module;
}

and then I use this to make the module visible:

@(x.Desktop().Modules(
    Create(MyModel.Create(), "http://www.google.com")))

The issue I'm having is that then I click on the shortcut for this module, it shows a gray box with the text "www.google.com refused to connect.". I'm not sure what I'm doing wrong here. I think it has something to do with how I'm declaring Loader but I'm not sure which values are incorrect.