diff --git a/Source/Editor/Modules/SceneModule.cs b/Source/Editor/Modules/SceneModule.cs
index 6334225fd..86479b696 100644
--- a/Source/Editor/Modules/SceneModule.cs
+++ b/Source/Editor/Modules/SceneModule.cs
@@ -22,14 +22,25 @@ namespace FlaxEditor.Modules
         /// <seealso cref="FlaxEditor.SceneGraph.RootNode" />
         public class ScenesRootNode : RootNode
         {
+            private readonly Editor _editor;
+
+            /// <inheritdoc />
+            public ScenesRootNode()
+            {
+                _editor = Editor.Instance;
+            }
+
             /// <inheritdoc />
             public override void Spawn(Actor actor, Actor parent)
             {
-                Editor.Instance.SceneEditing.Spawn(actor, parent);
+                _editor.SceneEditing.Spawn(actor, parent);
             }
 
             /// <inheritdoc />
             public override Undo Undo => Editor.Instance.Undo;
+
+            /// <inheritdoc />
+            public override List<SceneGraphNode> Selection => _editor.SceneEditing.Selection;
         }
 
         /// <summary>
diff --git a/Source/Editor/SceneGraph/Actors/SplineNode.cs b/Source/Editor/SceneGraph/Actors/SplineNode.cs
index b4914941a..7f9e4ca70 100644
--- a/Source/Editor/SceneGraph/Actors/SplineNode.cs
+++ b/Source/Editor/SceneGraph/Actors/SplineNode.cs
@@ -29,7 +29,7 @@ namespace FlaxEditor.SceneGraph.Actors
 
             public override bool CanBeSelectedDirectly => true;
 
-            public override bool CanDuplicate => true;
+            public override bool CanDuplicate => !Root?.Selection.Contains(ParentNode) ?? true;
 
             public override bool CanDelete => true;
 
diff --git a/Source/Editor/SceneGraph/RootNode.cs b/Source/Editor/SceneGraph/RootNode.cs
index 10af88489..485c656b1 100644
--- a/Source/Editor/SceneGraph/RootNode.cs
+++ b/Source/Editor/SceneGraph/RootNode.cs
@@ -1,6 +1,7 @@
 // Copyright (c) 2012-2021 Wojciech Figat. All rights reserved.
 
 using System;
+using System.Collections.Generic;
 using FlaxEditor.SceneGraph.Actors;
 using FlaxEngine;
 
@@ -146,5 +147,10 @@ namespace FlaxEditor.SceneGraph
         /// Gets the undo.
         /// </summary>
         public abstract Undo Undo { get; }
+
+        /// <summary>
+        /// Gets the list of selected scene graph nodes in the editor context.
+        /// </summary>
+        public abstract List<SceneGraphNode> Selection { get; }
     }
 }
diff --git a/Source/Editor/SceneGraph/SceneGraphNode.cs b/Source/Editor/SceneGraph/SceneGraphNode.cs
index 11c3b7709..76327918d 100644
--- a/Source/Editor/SceneGraph/SceneGraphNode.cs
+++ b/Source/Editor/SceneGraph/SceneGraphNode.cs
@@ -57,7 +57,9 @@ namespace FlaxEditor.SceneGraph
         /// </summary>
         public virtual RootNode Root => ParentNode?.Root;
 
-        /// <inheritdoc />
+        /// <summary>
+        /// Gets or sets the transform of the node.
+        /// </summary>
         public abstract Transform Transform { get; set; }
 
         /// <summary>
diff --git a/Source/Editor/Windows/Assets/PrefabWindow.Hierarchy.cs b/Source/Editor/Windows/Assets/PrefabWindow.Hierarchy.cs
index e671ba1de..afba74fbc 100644
--- a/Source/Editor/Windows/Assets/PrefabWindow.Hierarchy.cs
+++ b/Source/Editor/Windows/Assets/PrefabWindow.Hierarchy.cs
@@ -36,6 +36,9 @@ namespace FlaxEditor.Windows.Assets
 
             /// <inheritdoc />
             public override Undo Undo => _window.Undo;
+
+            /// <inheritdoc />
+            public override List<SceneGraphNode> Selection => _window.Selection;
         }
 
         /// <summary>