diff --git a/Bin/net40/SunnyUI.dll b/Bin/net40/SunnyUI.dll
index 4f2f6087..527170bd 100644
Binary files a/Bin/net40/SunnyUI.dll and b/Bin/net40/SunnyUI.dll differ
diff --git a/SunnyUI/Controls/UIListBox.cs b/SunnyUI/Controls/UIListBox.cs
index d4dc8a40..4b6b4a1c 100644
--- a/SunnyUI/Controls/UIListBox.cs
+++ b/SunnyUI/Controls/UIListBox.cs
@@ -25,6 +25,7 @@
  * 2021-07-30: V3.0.5 选中项显示方角
  * 2021-08-04: V3.0.5 增加Items变更的事件
  * 2021-12-29: V3.0.9 增加修改文字颜色
+ * 2022-02-23: V3.1.1 按键上下移动选择项目时，滚动条跟谁
 ******************************************************************************/
 
 using System;
@@ -712,6 +713,12 @@ namespace Sunny.UI
             //SetScrollInfo();
         }
 
+        protected override void OnSelectedIndexChanged(EventArgs e)
+        {
+            base.OnSelectedIndexChanged(e);
+            SetScrollInfo();
+        }
+
         public void SetScrollInfo()
         {
             if (Bar == null)