PanelOverflowBehavior.VerticalScroll not working properly? about geonbit.ui HOT 5 CLOSED

        protected override void BuildMenu()
        {
            MainPanel = new Panel(new Vector2(850, 400), PanelSkin.Default, Anchor.BottomCenter, new Vector2(0,100));
            PanelTabs tabs = new PanelTabs();
            MainPanel.AddChild(tabs);

            var cluttertab = tabs.AddTab(Global.catalog.GetString("Furniture"));
            cluttertab.panel.Padding = new Vector2(10,20);
            // List buildable clutter
            buildlist = GetClutterList(CreativeMode);
            cluttertab.panel.PanelOverflowBehavior = PanelOverflowBehavior.VerticalScroll;
            foreach (var item in buildlist)
            {
                Texture2D isprite = World.DB.Sprites[item.SpriteFile[0]];
                var isize = new Vector2(64, 64);
                var itxt = item.Name;

                var pan = Overlay.AddIcon(isprite, itxt, new Vector2(200, 100), Anchor.AutoInline);
                pan.AttachedData = item;
                // [cut] OnClick events 
                cluttertab.panel.AddChild(pan);
            }
            cluttertab.panel.Scrollbar.AdjustMaxAutomatically = true;
            // [cut] other tabs
        }

        /// <summary>
        /// Build "icon" looking UI element
        /// </summary>
        public static Panel AddIcon(Texture2D pTexture, string pTitle, Vector2 pSize, Anchor pAnchor)
        {
            var panel = new Panel(pSize, PanelSkin.None, pAnchor)
            {
                Padding = new Vector2(5, 5)
            };
            Icon icon = new Icon(IconType.None, Anchor.TopCenter, 1)
            {
                Texture = pTexture
            };
            panel.AddChild(icon);
            panel.AddChild(new Paragraph(pTitle, Anchor.BottomCenter));
            return panel;
        }