diff --git a/Source/Editor/CustomEditors/Editors/BehaviorKnowledgeSelectorEditor.cs b/Source/Editor/CustomEditors/Editors/BehaviorKnowledgeSelectorEditor.cs
index 8ac6a51cb..b3c5792ac 100644
--- a/Source/Editor/CustomEditors/Editors/BehaviorKnowledgeSelectorEditor.cs
+++ b/Source/Editor/CustomEditors/Editors/BehaviorKnowledgeSelectorEditor.cs
@@ -171,11 +171,13 @@ namespace FlaxEditor.CustomEditors.Editors
                 tree.Select(typeNode);
             if (addItems)
             {
-                var items = GenericEditor.GetItemsForType(type, type.IsClass, true);
+                var items = GenericEditor.GetItemsForType(type, type.IsClass, true, true);
                 foreach (var item in items)
                 {
                     if (typed && !typed.IsAssignableFrom(item.Info.ValueType))
                         continue;
+                    if (item.Info.DeclaringType.Type == typeof(FlaxEngine.Object))
+                        continue; // Skip engine internals
                     var itemPath = typePath + item.Info.Name;
                     var node = new TreeNode
                     {
diff --git a/Source/Editor/CustomEditors/Editors/GenericEditor.cs b/Source/Editor/CustomEditors/Editors/GenericEditor.cs
index 55ac453a9..68c24a675 100644
--- a/Source/Editor/CustomEditors/Editors/GenericEditor.cs
+++ b/Source/Editor/CustomEditors/Editors/GenericEditor.cs
@@ -247,8 +247,9 @@ namespace FlaxEditor.CustomEditors.Editors
         /// <param name="type">The type.</param>
         /// <param name="useProperties">True if use type properties.</param>
         /// <param name="useFields">True if use type fields.</param>
+        /// <param name="usePropertiesWithoutSetter">True if use type properties that have only getter method without setter method (aka read-only).</param>
         /// <returns>The items.</returns>
-        public static List<ItemInfo> GetItemsForType(ScriptType type, bool useProperties, bool useFields)
+        public static List<ItemInfo> GetItemsForType(ScriptType type, bool useProperties, bool useFields, bool usePropertiesWithoutSetter = false)
         {
             var items = new List<ItemInfo>();
 
@@ -264,7 +265,7 @@ namespace FlaxEditor.CustomEditors.Editors
                     var showInEditor = attributes.Any(x => x is ShowInEditorAttribute);
 
                     // Skip properties without getter or setter
-                    if (!p.HasGet || (!p.HasSet && !showInEditor))
+                    if (!p.HasGet || (!p.HasSet && !showInEditor && !usePropertiesWithoutSetter))
                         continue;
 
                     // Skip hidden fields, handle special attributes