void Inspectors_NewInspector(Outlook.Inspector Inspector)
    {
        MyTaskPane pane     = new MyTaskPane();
        var        taskPane = this.CustomTaskPanes.Add(pane, "My Custom Task Pane", Inspector);

        taskPane.DockPosition = Office.MsoCTPDockPosition.msoCTPDockPositionBottom;
        taskPane.Visible      = true;
    }
    private void ThisAddIn_Startup(object sender, System.EventArgs e)
    {
        MyTaskPane pane     = new MyTaskPane();
        var        taskPane = this.CustomTaskPanes.Add(pane, "My Custom Task Pane");

        taskPane.Visible = true;

        _inspectors = Application.Inspectors;
        _inspectors.NewInspector += Inspectors_NewInspector;
    }