public void AddRange(OutlookBarButtonCollection items)
 {
     foreach (OutlookBarButton item in items)
     {
         this.Add(item);
     }
 }
        public OutlookBarNavigationPaneOptions(OutlookBarButtonCollection items)
        {
            InitializeComponent();
            this.Items = items;
            foreach (OutlookBarButton b in this.Items)
            {
                this.OriginalItems.Add(b, null, null, null);
            }

            this.FillList();
            this.CheckedListBox1.SelectedIndex = 0;
        }