//private ListViewDragDropManager<DocumentGroup> _listViewDragDropManager;
        /// <summary>
        /// Initializes a new instance of the <see cref="SavedTabsToolWindowControl"/> class.
        /// </summary>
        public SavedTabsToolWindowControl(SaveAllTheTabsPackage package, SavedTabsWindowCommands commands)
        {
            Package = package;
            Commands = commands;

            Loaded += (sender, args) => RefreshBindingSources(Package.DocumentManager);
            Package.DocumentManager.GroupsReset += (sender, args) => RefreshBindingSources(sender as DocumentManager, true);

            Groups = package.DocumentManager?.Groups;

            InitializeComponent();

            //_listViewDragDropManager = new ListViewDragDropManager<DocumentGroup>(TabsList);
        }
        /// <summary>
        /// Initializes a new instance of the <see cref="SavedTabsToolWindow"/> class.
        /// </summary>
        public SavedTabsToolWindow()
            : base(null)
        {
            Caption = "Saved Tabs";

            // Set the image that will appear on the tab of the window frame
            // when docked with an other window
            // The resource ID correspond to the one defined in the resx file
            // while the Index is the offset in the bitmap strip. Each image in
            // the strip being 16x16.
            BitmapResourceID = 301;
            BitmapIndex = 1;

            var packageProvider = ServiceProvider.GlobalProvider.GetService(typeof(PackageProviderService)) as PackageProviderService;
            var package = packageProvider?.Package;

            var commands = new SavedTabsWindowCommands(package);
            ToolBar = commands.SetupToolbar();

            // This is the user control hosted by the tool window; Note that, even if this class implements IDisposable,
            // we are not calling Dispose on this object. This is because ToolWindowPane calls Dispose on
            // the object returned by the Content property.
            Content = new SavedTabsToolWindowControl(package, commands);
        }