diff --git a/CustomWidgets/TreeView/TreeNode.cs b/CustomWidgets/TreeView/TreeNode.cs
index 16cd6a713..234bf22c1 100644
--- a/CustomWidgets/TreeView/TreeNode.cs
+++ b/CustomWidgets/TreeView/TreeNode.cs
@@ -35,6 +35,7 @@ using MatterHackers.Agg.Font;
 using MatterHackers.Agg.Image;
 using MatterHackers.Agg.Platform;
 using MatterHackers.Agg.UI;
+using MatterHackers.ImageProcessing;
 using MatterHackers.VectorMath;
 
 namespace MatterHackers.MatterControl.CustomWidgets
@@ -160,6 +161,12 @@ namespace MatterHackers.MatterControl.CustomWidgets
 			return content?.Children.Where((c) => c is TreeNode).Count() ?? 0;
 		}
 
+		public bool AlwaysExpandable
+		{
+			get => expandWidget.AlwaysExpandable;
+			set => expandWidget.AlwaysExpandable = value;
+		}
+
 		public override void OnDraw(Graphics2D graphics2D)
 		{
 			if (isDirty)
@@ -421,10 +428,21 @@ namespace MatterHackers.MatterControl.CustomWidgets
 				this.AddChild(imageButton);
 			}
 
+			private bool _alwaysExpandable;
+			public bool AlwaysExpandable
+			{
+				get => _alwaysExpandable;
+				set
+				{
+					imageButton.SetIcon((_expanded) ? arrowDown : arrowRight);
+					_alwaysExpandable = value;
+				}
+			}
+
 			private bool? _expandable = null;
 			public bool Expandable
 			{
-				get => _expandable == true;
+				get => _expandable == true || this.AlwaysExpandable;
 				set
 				{
 					if (_expandable != value)
diff --git a/PartPreviewWindow/View3D/View3DWidget.cs b/PartPreviewWindow/View3D/View3DWidget.cs
index ccfb74cc1..825ae001b 100644
--- a/PartPreviewWindow/View3D/View3DWidget.cs
+++ b/PartPreviewWindow/View3D/View3DWidget.cs
@@ -198,6 +198,14 @@ namespace MatterHackers.MatterControl.PartPreviewWindow
 				}
 				selectedObjectPanel.SetActiveItem((IObject3D)treeView.SelectedNode.Tag);
 			};
+			treeView.ScrollArea.ChildAdded += (s, e) =>
+			{
+				if (e is GuiWidgetEventArgs childEventArgs
+					&& childEventArgs.Child is TreeNode treeNode)
+				{
+					treeNode.AlwaysExpandable = true;
+				}
+			};
 
 			var treeSection = new ResizableSectionWidget("Design History".Localize(), sceneContext.ViewState.SceneTreeHeight, treeView, theme, expanded: false);
 			treeSection.Resized += (s, e) =>