如何在VSTO中的Excel状态栏中显示“更新工作流状态”进度条？

using Microsoft.Office.Core;
using System.Windows.Forms;

namespace YourNamespace
{
    public partial class ThisAddIn
    {
        private ProgressBar progressBar;

        protected override Office.IRibbonExtensibility CreateRibbonExtensibilityObject()
        {
            progressBar = new ProgressBar();
            Globals.ThisAddIn.Application.StatusBar = (progressBar as IStatusBar).StatusBar as string;
            return new Ribbon1();
        }

        private void ThisAddIn_Startup(object sender, System.EventArgs e)
        {
        }

        private void ThisAddIn_Shutdown(object sender, System.EventArgs e)
        {
        }
    }

    public interface IStatusBar
    {
        object StatusBar { get; set; }
    }

    public class ProgressBar : IStatusBar
    {
        public object StatusBar
        {
            get
            {
                return CreateProgressBar();
            }
            set
            {
                // Do nothing
            }
        }

        private object CreateProgressBar()
        {
            var progressBar = new ProgressBarControl();
            progressBar.Location = ProgressBarLocation.None;
            progressBar.Caption = "Updating Workflow Status...";
            progressBar.Visible = true;
            return progressBar;
        }
    }
}