Event not firing with Outlook Addin 2007

See more:

C#

VSTO

Outlook

AddIn

Hi,
In my outlook 2007 AddIn, Menu is appearing.... But, Context Menu Click event is not firing...
Please point out what's the issue with my code ....

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

          var inspectors = this.Application.Inspectors;

          Application.ItemContextMenuDisplay += new Outlook.ApplicationEvents_11_ItemContextMenuDisplayEventHandler(myApp_FolderContextMenuDisplay);

      }

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


      void myApp_FolderContextMenuDisplay(Office.CommandBar commandBar, Outlook.Selection Folder)
      {

          if (Folder[1] is Outlook.ContactItem)
          {

              var contextButton = commandBar.Controls.Add(Office.MsoControlType.msoControlButton, missing, missing, 1, true) as Office.CommandBarButton;
              contextButton.Visible = true;
              contextButton.Caption = "Call Using FPHone";
              contextButton.Height = 30;
              contextButton.Parameter = "Call";
              contextButton.Click += new Office._CommandBarButtonEvents_ClickEventHandler(contextButton_Click);
           }
}

void contextButton_Click(Office.CommandBarButton Ctrl, ref bool CancelDefault)
        {
//This event is not firing
}