Disable Excel Security Dialogs when using DsoFramer

Question

I'm using the old DsoFramer control to embedded an instance of Excel in a form of mine. This has been working fine with Excel 2000, 2003 and 2007.

Come 2010 however I think its behaving slightly differently. I now get a prompt about macros, which then blocks my UI until the user shifts focus to the excel instance in the background and clicks ok.

I know that Microsoft don't endorse using this control anymore, but unfortunately we're not in a position to replace it yet. So what I'm looking for our ways to try and disable this dialog. I've tried using the MsoAutomationSecurity.msoAutomationSecurityForceDisable enum but this doesn't seem to make any difference. If I open the file directly through code then its fine and doesn't prompt, but the axFramer.Open() call always causes it to prompt. Does anyone know of a way round this?

Code to reproduce this issue in a simple WinForm app (you'll need to substitute the file path to a file containing macros).

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using Microsoft.Office.Interop.Excel;
using System.Diagnostics;

namespace WindowsFormsApplication1
{
    public partial class Form1 : System.Windows.Forms.Form
    {
    private AxDSOFramer.AxFramerControl axFramer;

    public Form1()
    {
        // Kill any Excel processes first so they don't interfere with our tests
        KillExcelProcesses();
        InitializeComponent();

        try
        {
            CreateAndAddFramer();

            string file = @"c:\temp\date_6490.xls";

            // Create a new Excel Application. For the purpose of the test lets ensure it's visible too.
            Application excelApp = new Application() { Visible = true, DisplayAlerts = false };

            // Set the Excel security to Forcefully disable all macros.
            excelApp.AutomationSecurity = Microsoft.Office.Core.MsoAutomationSecurity.msoAutomationSecurityForceDisable;

            // Open the file. This is because it needs to be open before trying with the DsoFramer
            // control. It also demonstrates that excel opens fine without prompting for any 
            // macro support.
            Workbook selectedBook = excelApp.Workbooks.Open(file);

            // Open the file in the framer. This will now prompt to enable macros.
            axFramer.Open(file, true, null, null, null);
        }
        catch (Exception e)
        {
            System.Windows.Forms.MessageBox.Show(e.ToString());
            KillExcelProcesses();
        }
    }

    /// <summary>
    /// Creates a DsoFramer and adds to the form.
    /// </summary>
    private void CreateAndAddFramer()
    {
        // Create an axFramer control
        this.axFramer = new AxDSOFramer.AxFramerControl();

        // Initialize the axFamer
        ((System.ComponentModel.ISupportInitialize)(this.axFramer)).BeginInit();

        // Update the name of the framer (bug in framer)
        this.axFramer.Name = "framer_" + Guid.NewGuid().ToString();
        this.axFramer.ResetText();

        // Dock the framer and add to the form
        this.axFramer.Dock = System.Windows.Forms.DockStyle.Fill;
        this.Controls.Add(axFramer);
        ((System.ComponentModel.ISupportInitialize)(this.axFramer)).EndInit();
    }

    /// <summary>
    /// Kills all excel processes.
    /// </summary>
    private static void KillExcelProcesses()
    {
        // Kill all instances of Excel
        foreach (Process p in Process.GetProcessesByName("excel"))
        {
            p.Kill();
        }
    }
}

}