diff --git a/addons/godot-traits/core/container/gtraits_container.gd b/addons/godot-traits/core/container/gtraits_container.gd
index c8bd462..0761853 100644
--- a/addons/godot-traits/core/container/gtraits_container.gd
+++ b/addons/godot-traits/core/container/gtraits_container.gd
@@ -51,6 +51,9 @@ func _init() -> void:
     # This callback is called before the trait _ready function and after it's _init function
     # so it's perfect to invoke the trait _initialize function
     child_order_changed.connect(_on_child_order_changed)
+    # Children added to this container outside SceneTree are not yet declared as trait
+    # So when this container is added to the scene tree, declare them as trait if needed
+    tree_entered.connect(_on_child_order_changed)
 
 #------------------------------------------
 # Public functions