ProgressBar en Treeview

Hola estaba haciendo una aplicacion y me aparece el  siguiente advertencia:

 (Mp3SpiderDev:11288): GLib-GObject-WARNING **: IA__g_object_set_property:
object class `GtkCellRendererProgress' has no property named `progress'

aca el codigo

        private Controlador control;
        private Gtk.ListStore     musicListStore;

        public WinDownload(Controlador c)
        {
            control = c;
            this.Build();
            CreateStore();

            Gtk.ProgressBar p = new Gtk.ProgressBar();
            p.Orientation = Gtk.ProgressBarOrientation.LeftToRight;
            p.PulseStep = 0.1;

            this.musicListStore.AppendValues("1","artista - lalala",new
Gdk.Pixbuf("desmm_load_w.gif"),p,"4,19","2,1","44 kbps", "7 segs");


        }
        public void addDownload(DownloadLink dl, List<string> info) {

        }

        protected virtual void OnDeleteEvent (object o, Gtk.DeleteEventArgs
args)
        {
            args.RetVal = true;
            this.Visible = false;
        }

        public void CreateStore() {
            musicListStore = new Gtk.ListStore (typeof (string),typeof
(string),typeof(Gdk.Pixbuf), typeof (Gtk.ProgressBar),typeof (string),typeof
(string),typeof (string),typeof (string));
            Gtk.TreeViewColumn numDownload = new Gtk.TreeViewColumn ();
            numDownload.Title = "#";
            Gtk.CellRendererText numberCell = new Gtk.CellRendererText ();
            numDownload.PackStart (numberCell, true);


            Gtk.TreeViewColumn fileNameColumn = new Gtk.TreeViewColumn ();
            fileNameColumn.Title = "File Name";

            Gtk.CellRendererText fileNameCell = new Gtk.CellRendererText ();
            fileNameColumn.PackStart (fileNameCell, true);

            Gtk.TreeViewColumn statusColumn = new Gtk.TreeViewColumn ();
            statusColumn.Title = "Status";

            Gtk.CellRendererPixbuf statusCell = new Gtk.CellRendererPixbuf
();
            statusColumn.PackStart (statusCell, true);

            Gtk.TreeViewColumn progressColumn = new Gtk.TreeViewColumn ();
            progressColumn.Title = "Progress";

            Gtk.CellRendererProgress progressCell = new
Gtk.CellRendererProgress ();
            progressColumn.PackStart (progressCell, true);

            Gtk.TreeViewColumn fileSizeColumn = new Gtk.TreeViewColumn ();
            fileSizeColumn.Title = "FileSize";

            Gtk.CellRendererText fileSIzeCell = new Gtk.CellRendererText ();
            fileSizeColumn.PackStart (fileSIzeCell, true);

            Gtk.TreeViewColumn downloadedColumn = new Gtk.TreeViewColumn ();
            downloadedColumn.Title = "Downloaded";

            Gtk.CellRendererText downloadedCell = new Gtk.CellRendererText
();
            downloadedColumn.PackStart (downloadedCell, true);

            Gtk.TreeViewColumn speedColumn = new Gtk.TreeViewColumn ();
            speedColumn.Title = "Speed";

            Gtk.CellRendererText speedCell = new Gtk.CellRendererText ();
            speedColumn.PackStart (speedCell, true);

            Gtk.TreeViewColumn timeLeftColumn = new Gtk.TreeViewColumn ();
            timeLeftColumn.Title = "Time Left";

            Gtk.CellRendererText timeLeftCell = new Gtk.CellRendererText ();
            timeLeftColumn.PackStart (timeLeftCell, true);

            this.treeview2.AppendColumn (numDownload);
            this.treeview2.AppendColumn (fileNameColumn);
            this.treeview2.AppendColumn (statusColumn);
            this.treeview2.AppendColumn (progressColumn);
            this.treeview2.AppendColumn (fileSizeColumn);
            this.treeview2.AppendColumn (downloadedColumn);
            this.treeview2.AppendColumn (speedColumn);
            this.treeview2.AppendColumn (timeLeftColumn);


            numDownload.AddAttribute(numberCell,"text", 0);
            fileNameColumn.AddAttribute (fileNameCell, "text", 1);
            statusColumn.AddAttribute (statusCell, "pixbuf", 2);
            progressColumn.AddAttribute(progressCell,"progress",3);
            fileSizeColumn.AddAttribute(fileSIzeCell,"text", 4);
            downloadedColumn.AddAttribute (downloadedCell, "text",5);
            speedColumn.AddAttribute (speedCell, "text", 6);
            timeLeftColumn.AddAttribute(timeLeftCell,"text",7);

            this.treeview2.Model = musicListStore;
        }

Saludos!

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