GetFile MVC method not called in VirtualPathProvider

Question

I created VirtualPathProvider to read partial views (from Azure Storage), but when I get to the page where I want VirtualPathProvider to go look for the view (in Azure Storage), it does not call the GetFile method. Therefore, it does not find the file. The FileExists method calls and returns true.

Here is the page containing the view I want to download:

@model VTSMVC.Models.Controls.ControlData

@{
    Layout = "~/Views/Shared/_Layout.cshtml";
}

@{
    ViewBag.Title = @Model.PageTitle;
}

<h1>@ViewBag.Title</h1>

<div class="stockReportContainer">

    @Html.Partial(@Model.ViewCompName, @Model)

</div>

Here is the controller method that loads the view:

    public ActionResult Interactive_Stock_Report()
    {

        ControlData cd = GetControlData();

          //this is the view returned on initial load
            return View(cd);
    }

Finally, here is VirtualPathProvider:

using Microsoft.WindowsAzure;
using Microsoft.WindowsAzure.Storage;
using Microsoft.WindowsAzure.Storage.Blob;
using System;
using System.Collections.Generic;
using System.Configuration;
using System.IO;
using System.Linq;
using System.Web;
using System.Web.Hosting;

namespace VTSMVC.Helpers.Utilities
{
public class BlobStorageVirtualPathProvider : VirtualPathProvider
{
    public override bool FileExists(string virtualPath)
    {
        // Check if the file exists on blob storage 
        string cleanVirtualPath = virtualPath.Replace(@"~/Views/Shared/", "");
        if (BlobExists(cleanVirtualPath))
        {
            return true;
        }
        else
        {
            return Previous.FileExists(virtualPath);
        }
    }

    public override VirtualFile GetFile(string virtualPath)
    {
        //This gets called but only at the points where I don't need it 
        //ie it gets called where where I want Azure 
        string cleanVirtualPath = virtualPath.Replace(@"~/Views/Shared/", "");
        if (BlobExists(cleanVirtualPath))
        {
            return new BlobStorageVirtualFile(virtualPath, this);
        }
        else
        {
            return Previous.GetFile(virtualPath);
        }
    }

    public override System.Web.Caching.CacheDependency GetCacheDependency(string virtualPath, System.Collections.IEnumerable virtualPathDependencies, DateTime utcStart)
    {
        return null;
    }

    private bool BlobExists(string cleanVirtualPath)
    {
        switch(cleanVirtualPath)
        {
            //just doing a simple test for now
            case "_MyStorageViewFile.cshtml":
                return true;
            default:
                return false;
        }
    }
}

public class BlobStorageVirtualFile : VirtualFile
{
    protected readonly BlobStorageVirtualPathProvider parent;

    public BlobStorageVirtualFile(string virtualPath, BlobStorageVirtualPathProvider parentProvider) : base(virtualPath)
    {
        parent = parentProvider;
    }

    public override System.IO.Stream Open()
    {
        //Open Method blah blah blah - 
        //not getting to this point since GetFile doesnt get called!!   
    }
}
}