改了什么呢，我不知道啊

Assets/Scripts/DynamicUI/Hierarchy/HierarchyTab.cs

@@ -2,6 +2,7 @@ using System.Collections;
 using System.Collections.Generic;
 using Ichni.RhythmGame;
 using Michsky.MUIP;
+using Sirenix.Utilities;
 using TMPro;
 using UnityEngine;
 using UnityEngine.InputSystem;
@@ -68,6 +69,7 @@ namespace Ichni.Editor
                     d.GetComponent<RectTransform>().anchoredPosition = new Vector2(lineX, 0);
                     StartCoroutine(WindowAnim.ShowPanelOnScale(d.gameObject));
                 }
+                parentTab.SetStatus();
             }
 
 
@@ -76,6 +78,12 @@ namespace Ichni.Editor
             tabButton.onClick.AddListener(SelectGameElement);
             expandButton.onClick.AddListener(ExpandOrFold);
             deleteButton.onConfirm = () => EditorManager.instance.operationManager.CopyPasteDeleteModule.DeleteElement(connectedGameElement);
+
+            SetStatus();
+        }
+        public void SetStatus()
+        {
+            expandButton.interactable = !connectedGameElement.childElementList.IsNullOrEmpty();
         }
     }
 
@@ -111,7 +119,7 @@ namespace Ichni.Editor
                 EditorManager.instance.operationManager.ClearSelectedElements();
                 EditorManager.instance.operationManager.AddSelectElement(connectedGameElement);
             }
-            
+
             EditorManager.instance.uiManager.inspector.SetInspector(connectedGameElement);
             EditorManager.instance.timeline.SetTimeLine(connectedGameElement); // TODO: Error
         }
@@ -124,7 +132,7 @@ namespace Ichni.Editor
             if (isExpanded)
             {
                 connectedGameElement.childElementList.Sort();//TODO: 后续可以让玩家手动快速排序
-                
+
                 for (var index = 0; index < connectedGameElement.childElementList.Count; index++)
                 {
                     var childElement = connectedGameElement.childElementList[index];