Can't find Controls - WebForms w/ nested Master pages

Has anyone had any success using WebFormsTest with nested Master Pages in WebForms?

I'm able to get WebApplicationProxy.Create to run, and WebApplicationProxy.GetPageLocation to run just fine, but controls are never able to be found.

```

WebApplicationProxy.Create(typeof(Platform.applications.applications), options);
var page= WebApplicationProxy.GetPageByLocation("/applications/test.aspx");
page.RunToEvent(WebFormEvent.Init);

var testControl= page.FindControl("btnTest"); // no controls are ever found recursively or otherwise.
```

Here is an example Master-page that inherits from a nested Master Page
```
<%@ Master Language="C#" MasterPageFile="~/Main.Master" AutoEventWireup="true" CodeBehind="Site1.master.cs" Inherits="Platform.applications.Site1" %>
<%@ MasterType VirtualPath="~/Main.Master" %>

`
```

Thanks