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 --- !u!1001 &7508193496350277438
 PrefabInstance:
   m_ObjectHideFlags: 0

Assets/Scripts/Studio/UI/Panel/Panel_MQTTSetting.cs

@@ -11,6 +11,7 @@ namespace Studio.UI
     {
         private RectTransform Content;
         private Button Button_AddMQTTConnectionItem;
+        private RectTransform AddMQTTConnection;
 
         private UI_MQTTConnection prf_MQTTConnectionItem;
         private List<UI_MQTTConnection> mqttConnectionItems = new List<UI_MQTTConnection>();
@@ -38,7 +39,7 @@ namespace Studio.UI
             item.onRemoveMQTTConnectionItem += RemoveMQTTConnectionItem;
 
             AddMQTTConnectionItem(item);
-            Button_AddMQTTConnectionItem.transform.SetAsLastSibling();
+            AddMQTTConnection.transform.SetAsLastSibling();
         }
         private void AddMQTTConnectionItem(UI_MQTTConnection item)
         {