Excel 2013 Custom task pane not displaying

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MS-Excel

C#5.0

Hi All,

I need to migrate my existing custom taskpane program to work with Excel 2013.
I encounter task pane not appearing issue.

So i decided to create custom task pane prototype for the Excel 2013 based on
https://msdn.microsoft.com/en-us/library/aa942846.aspx[^] for testing purpose.

I have disable/remove all active add-in in my Excel 2013.
But this protoype custom taskpane still does not appear when go to debug mode.
There is no programming error encounter by MS Visual Studio during debugging.

What else did i miss/do wrong?

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml.Linq;
using Excel = Microsoft.Office.Interop.Excel;
using Office = Microsoft.Office.Core;
using Microsoft.Office.Tools.Excel;

namespace ExcelAddIn5
{
    public partial class ThisAddIn
    {
        private MyUserControl myUserControl1;
        private Microsoft.Office.Tools.CustomTaskPane myCustomTaskPane;

        private void ThisAddIn_Startup(object sender, System.EventArgs e)
        {
            myUserControl1 = new MyUserControl();
            myCustomTaskPane = this.CustomTaskPanes.Add(myUserControl1, "My Task Pane");
            myCustomTaskPane.Visible = true;
        }

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

        #region VSTO generated code

        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InternalStartup()
        {
            this.Startup += new System.EventHandler(ThisAddIn_Startup);
            this.Shutdown += new System.EventHandler(ThisAddIn_Shutdown);
        }
        
        #endregion
    }
}