diff --git a/Source/Engine/Level/Actor.cpp b/Source/Engine/Level/Actor.cpp
index 2615f09fa..479d67bcd 100644
--- a/Source/Engine/Level/Actor.cpp
+++ b/Source/Engine/Level/Actor.cpp
@@ -609,7 +609,10 @@ void Actor::SetIsActive(bool value)
 
 void Actor::SetStaticFlags(StaticFlags value)
 {
+    if (_staticFlags == value)
+        return;
     _staticFlags = value;
+    OnStaticFlagsChanged();
 }
 
 void Actor::SetTransform(const Transform& value)
@@ -1226,6 +1229,14 @@ void Actor::OnOrderInParentChanged()
     Level::callActorEvent(Level::ActorEventType::OnActorOrderInParentChanged, this, nullptr);
 }
 
+void Actor::OnStaticFlagsChanged()
+{
+}
+
+void Actor::OnLayerChanged()
+{
+}
+
 BoundingBox Actor::GetBoxWithChildren() const
 {
     BoundingBox result = GetBox();
diff --git a/Source/Engine/Level/Actor.h b/Source/Engine/Level/Actor.h
index 98045fc85..dc77cdbee 100644
--- a/Source/Engine/Level/Actor.h
+++ b/Source/Engine/Level/Actor.h
@@ -886,14 +886,12 @@ public:
     /// Gets rotation of the actor oriented towards the specified world position with upwards direction.
     /// </summary>
     /// <param name="worldPos">The world position to orient towards.</param>
-    /// <param name="worldUp">The up direction that Constrains y axis orientation to a plane this vector lies on. This rule might be broken if forward and up direction are nearly parallel.</param>
+    /// <param name="worldUp">The up direction that constrains up axis orientation to a plane this vector lies on. This rule might be broken if forward and up direction are nearly parallel.</param>
     API_FUNCTION() Quaternion LookingAt(const Vector3& worldPos, const Vector3& worldUp) const;
 
 public:
     /// <summary>
     /// Execute custom action on actors tree.
-    /// Action should returns false to stop calling deeper.
-    /// First action argument is current actor object.
     /// </summary>
     /// <param name="action">Actor to call on every actor in the tree. Returns true if keep calling deeper.</param>
     /// <param name="args">Custom arguments for the function</param>
@@ -903,14 +901,12 @@ public:
         if (action(this, args...))
         {
             for (int32 i = 0; i < Children.Count(); i++)
-                Children[i]->TreeExecute<Params...>(action, args...);
+                Children.Get()[i]->TreeExecute<Params...>(action, args...);
         }
     }
 
     /// <summary>
     /// Execute custom action on actor children tree.
-    /// Action should returns false to stop calling deeper.
-    /// First action argument is current actor object.
     /// </summary>
     /// <param name="action">Actor to call on every actor in the tree. Returns true if keep calling deeper.</param>
     /// <param name="args">Custom arguments for the function</param>
@@ -918,7 +914,7 @@ public:
     void TreeExecuteChildren(Function<bool(Actor*, Params ...)>& action, Params ... args)
     {
         for (int32 i = 0; i < Children.Count(); i++)
-            Children[i]->TreeExecute<Params...>(action, args...);
+            Children.Get()[i]->TreeExecute<Params...>(action, args...);
     }
 
 public:
@@ -1016,12 +1012,15 @@ public:
     /// </summary>
     virtual void OnOrderInParentChanged();
 
+    /// <summary>
+    /// Called when actor static flag gets changed.
+    /// </summary>
+    virtual void OnStaticFlagsChanged();
+
     /// <summary>
     /// Called when layer gets changed.
     /// </summary>
-    virtual void OnLayerChanged()
-    {
-    }
+    virtual void OnLayerChanged();
 
     /// <summary>
     /// Called when adding object to the game.