diff --git a/ApplicationView/ApplicationController.cs b/ApplicationView/ApplicationController.cs
index 8e92d6ae2..0ea59dc7e 100644
--- a/ApplicationView/ApplicationController.cs
+++ b/ApplicationView/ApplicationController.cs
@@ -401,7 +401,7 @@ namespace MatterHackers.MatterControl
 				TitleResolver = () => "Proportional Scale".Localize(),
 				Action = (scene) =>
 				{
-					HoldChildProportional.AddSelectionAsChildren(scene, new HoldChildProportional(), nameof(ProportionalEditor), "Proportional Scale");
+					scene.AddSelectionAsChildren(new HoldChildProportional());
 				},
 				//Icon = AggContext.StaticData.LoadIcon("subtract.png").SetPreMultiply(),
 				IsEnabled = (scene) => scene.HasSelection,
@@ -411,7 +411,7 @@ namespace MatterHackers.MatterControl
 				TitleResolver = () => "Array".Localize(),
 				Action = (scene) =>
 				{
-					HoldChildProportional.AddSelectionAsChildren(scene, new ArrayObject3D(), nameof(ArrayObject3D), "Array Part");
+					scene.AddSelectionAsChildren(new ArrayObject3D());
 					if(scene.SelectedItem is ArrayObject3D array)
 					{
 						array.Rebuild();
diff --git a/DesignTools/Operations/Object3DExtensions.cs b/DesignTools/Operations/Object3DExtensions.cs
index 8f193905a..f53fb6e47 100644
--- a/DesignTools/Operations/Object3DExtensions.cs
+++ b/DesignTools/Operations/Object3DExtensions.cs
@@ -35,6 +35,7 @@ using System.Threading;
 using MatterHackers.Agg.Font;
 using MatterHackers.Agg.Platform;
 using MatterHackers.DataConverters3D;
+using MatterHackers.DataConverters3D.UndoCommands;
 using MatterHackers.MatterControl.PartPreviewWindow.View3D;
 using MatterHackers.PolygonMesh;
 using MatterHackers.RenderOpenGl;
@@ -63,6 +64,54 @@ namespace MatterHackers.MatterControl.DesignTools.Operations
 			return resultsA;
 		}
 
+		public static void AddSelectionAsChildren(this InteractiveScene scene, IObject3D newParent)
+		{
+			if (scene.HasSelection)
+			{
+				IObject3D item;
+
+				List<IObject3D> itemsToReplace;
+
+				if (scene.SelectedItem is SelectionGroup)
+				{
+					Object3D container = new Object3D();
+					itemsToReplace = scene.SelectedItem.Children.ToList();
+					foreach (var child in itemsToReplace)
+					{
+						container.Children.Add(child.Clone());
+					}
+					item = container;
+				}
+				else
+				{
+					itemsToReplace = new List<IObject3D> { scene.SelectedItem };
+					item = scene.SelectedItem.Clone();
+				}
+
+				scene.SelectedItem = null;
+
+				newParent.Children.Add(item);
+
+				newParent.MakeNameNonColliding();
+
+				scene.UndoBuffer.AddAndDo(
+					new ReplaceCommand(
+						itemsToReplace,
+						new List<IObject3D> { newParent }));
+
+				if (newParent is HoldChildProportional pe)
+				{
+					item.Matrix = Matrix4X4.Identity;
+
+					// Make the object have an identity matrix and keep its position in our new object
+					newParent.Matrix = item.Matrix;
+					pe.InitialChildBounds = item.GetAxisAlignedBoundingBox();
+				}
+
+				scene.SelectedItem = newParent;
+			}
+		}
+
 		public static void WrapWith(this IObject3D originalItem, IObject3D wrapper, BedConfig sceneContext)
 		{
 			originalItem.Parent.Children.Modify(list =>
diff --git a/PartPreviewWindow/View3D/Actions/ProportionalEditor.cs b/PartPreviewWindow/View3D/Actions/ProportionalEditor.cs
index 208f0323b..ab6b554fb 100644
--- a/PartPreviewWindow/View3D/Actions/ProportionalEditor.cs
+++ b/PartPreviewWindow/View3D/Actions/ProportionalEditor.cs
@@ -79,54 +79,6 @@ namespace MatterHackers.MatterControl.PartPreviewWindow.View3D
 
 			base.OnInvalidate();
 		}
-
-		public static void AddSelectionAsChildren(InteractiveScene scene, IObject3D newParent, string classDescriptor, string editorName)
-		{
-			if (scene.HasSelection)
-			{
-				IObject3D itemToHoldProportional;
-
-				List<IObject3D> itemsToReplace;
-
-				if (scene.SelectedItem is SelectionGroup)
-				{
-					Object3D container = new Object3D();
-					itemsToReplace = scene.SelectedItem.Children.ToList();
-					foreach (var child in itemsToReplace)
-					{
-						container.Children.Add(child.Clone());
-					}
-					itemToHoldProportional = container;
-				}
-				else
-				{
-					itemsToReplace = new List<IObject3D> { scene.SelectedItem };
-					itemToHoldProportional = scene.SelectedItem.Clone();
-				}
-
-				scene.SelectedItem = null;
-
-				newParent.Children.Add(itemToHoldProportional);
-
-				newParent.MakeNameNonColliding();
-
-				scene.UndoBuffer.AddAndDo(
-					new ReplaceCommand(
-						itemsToReplace,
-						new List<IObject3D> { newParent }));
-
-				// Make the object have an identity matrix and keep its position in our new object
-				newParent.Matrix = itemToHoldProportional.Matrix;
-				itemToHoldProportional.Matrix = Matrix4X4.Identity;
-
-				if (newParent is HoldChildProportional pe)
-				{
-					pe.InitialChildBounds = itemToHoldProportional.GetAxisAlignedBoundingBox();
-				}
-
-				scene.SelectedItem = newParent;
-			}
-		}
 	}
 
 	public class ProportionalEditor : IObject3DEditor