diff --git a/Source/Editor/Surface/Archetypes/Function.cs b/Source/Editor/Surface/Archetypes/Function.cs
index 7c4963072..b7584a2b8 100644
--- a/Source/Editor/Surface/Archetypes/Function.cs
+++ b/Source/Editor/Surface/Archetypes/Function.cs
@@ -1387,6 +1387,9 @@ namespace FlaxEditor.Surface.Archetypes
                 }
             }
 
+            /// <summary>
+            /// The cached signature. This might not be loaded if called from other not initialization (eg. node initialized before this function node). Then use GetSignature method.
+            /// </summary>
             internal Signature _signature;
 
             /// <inheritdoc />
@@ -1395,6 +1398,13 @@ namespace FlaxEditor.Surface.Archetypes
             {
             }
 
+            public void GetSignature(out Signature signature)
+            {
+                if (_signature.Node == null)
+                    LoadSignature();
+                signature = _signature;
+            }
+
             private void SaveSignature()
             {
                 using (var stream = new MemoryStream())
@@ -1568,6 +1578,13 @@ namespace FlaxEditor.Surface.Archetypes
 
                     // Update node interface
                     UpdateUI();
+
+                    // Send event
+                    for (int i = 0; i < Surface.Nodes.Count; i++)
+                    {
+                        if (Surface.Nodes[i] is IFunctionsDependantNode node)
+                            node.OnFunctionEdited(this);
+                    }
                 };
                 editor.Show(this, Vector2.Zero);
             }
@@ -1622,6 +1639,13 @@ namespace FlaxEditor.Surface.Archetypes
                 base.OnLoaded();
 
                 LoadSignature();
+
+                // Send event
+                for (int i = 0; i < Surface.Nodes.Count; i++)
+                {
+                    if (Surface.Nodes[i] is IFunctionsDependantNode node)
+                        node.OnFunctionCreated(this);
+                }
             }
 
             /// <inheritdoc />
@@ -1639,6 +1663,26 @@ namespace FlaxEditor.Surface.Archetypes
 
                 // Start editing
                 OnEditSignature();
+
+                // Send event
+                for (int i = 0; i < Surface.Nodes.Count; i++)
+                {
+                    if (Surface.Nodes[i] is IFunctionsDependantNode node)
+                        node.OnFunctionCreated(this);
+                }
+            }
+
+            /// <inheritdoc />
+            public override void OnDeleted()
+            {
+                // Send event
+                for (int i = 0; i < Surface.Nodes.Count; i++)
+                {
+                    if (Surface.Nodes[i] is IFunctionsDependantNode node)
+                        node.OnFunctionDeleted(this);
+                }
+
+                base.OnDeleted();
             }
 
             /// <inheritdoc />
@@ -1647,6 +1691,13 @@ namespace FlaxEditor.Surface.Archetypes
                 base.OnValuesChanged();
 
                 LoadSignature();
+
+                // Send event
+                for (int i = 0; i < Surface.Nodes.Count; i++)
+                {
+                    if (Surface.Nodes[i] is IFunctionsDependantNode node)
+                        node.OnFunctionEdited(this);
+                }
             }
 
             /// <inheritdoc />
@@ -1752,7 +1803,6 @@ namespace FlaxEditor.Surface.Archetypes
         {
             private bool _isTypesChangedEventRegistered;
 
-            /// <inheritdoc />
             public SetFieldNode(uint id, VisjectSurfaceContext context, NodeArchetype nodeArch, GroupArchetype groupArch)
             : base(id, context, nodeArch, groupArch)
             {
diff --git a/Source/Editor/Surface/IFunctionDependantNode.cs b/Source/Editor/Surface/IFunctionDependantNode.cs
new file mode 100644
index 000000000..e66c10e92
--- /dev/null
+++ b/Source/Editor/Surface/IFunctionDependantNode.cs
@@ -0,0 +1,31 @@
+// Copyright (c) 2012-2021 Wojciech Figat. All rights reserved.
+
+using FlaxEngine;
+
+namespace FlaxEditor.Surface
+{
+    /// <summary>
+    /// Interface for surface nodes that depend on surface function nodes collection.
+    /// </summary>
+    [HideInEditor]
+    public interface IFunctionsDependantNode
+    {
+        /// <summary>
+        /// On function created.
+        /// </summary>
+        /// <param name="node">The function node.</param>
+        void OnFunctionCreated(SurfaceNode node);
+
+        /// <summary>
+        /// On function signature changed (new name or parameters change).
+        /// </summary>
+        /// <param name="node">The function node.</param>
+        void OnFunctionEdited(SurfaceNode node);
+
+        /// <summary>
+        /// On function removed.
+        /// </summary>
+        /// <param name="node">The function node.</param>
+        void OnFunctionDeleted(SurfaceNode node);
+    }
+}