public override void OnActivate() { BackgroundColor = Color.Blue; BorderColor = Color.White; hasChanged = true; internalGrid = new UIGridList(); internalGrid.OnScrollWheel += PartExchangeUI.onScrollWheelForUIText; //scrollbar = new UIScrollbar(); scrollbar = new InvisibleScrollbar(); Append(internalGrid); scrollbar.SetView(100f, 1000f); scrollbar.Height.Set(0, 1f); scrollbar.Width.Set(1, 0); scrollbar.Left.Set(-14, 1f); Append(scrollbar); internalGrid.SetScrollbar(scrollbar); allTree.open(); }