diff --git a/SunnyUI/Controls/DropItem/UIToolStripDropDown.cs b/SunnyUI/Controls/DropItem/UIToolStripDropDown.cs
index 95029e46..9aae6db8 100644
--- a/SunnyUI/Controls/DropItem/UIToolStripDropDown.cs
+++ b/SunnyUI/Controls/DropItem/UIToolStripDropDown.cs
@@ -31,7 +31,7 @@ namespace Sunny.UI
     {
         private UIDropDown itemForm;
 
-        public UIToolStripDropDown(UIDropDownItem item)
+        public UIToolStripDropDown(UIDropDownItem item, bool autoClose = true)
         {
             itemForm = new UIDropDown(item);
             itemForm.ValueChanged += ItemForm_ValueChanged;
@@ -39,6 +39,7 @@ namespace Sunny.UI
             itemForm.Closed += ItemForm_Closed;
             itemForm.Opened += ItemForm_Opened;
             itemForm.Opening += ItemForm_Opening;
+            itemForm.AutoClose = autoClose;
         }
 
         public Size ItemSize => itemForm.Size;
diff --git a/SunnyUI/Controls/UIEdit.cs b/SunnyUI/Controls/UIEdit.cs
index 7321820a..a4da0140 100644
--- a/SunnyUI/Controls/UIEdit.cs
+++ b/SunnyUI/Controls/UIEdit.cs
@@ -206,6 +206,20 @@ namespace Sunny.UI
             }
         }
 
+        public event OnSelectionChanged SelectionChanged;
+
+        protected override void OnKeyUp(KeyEventArgs e)
+        {
+            base.OnKeyUp(e);
+            SelectionChanged?.Invoke(this, new UITextBoxSelectionArgs() { SelectionStart = this.SelectionStart, Text = this.Text });
+        }
+
+        protected override void OnMouseDown(MouseEventArgs e)
+        {
+            base.OnMouseDown(e);
+            SelectionChanged?.Invoke(this, new UITextBoxSelectionArgs() { SelectionStart = this.SelectionStart, Text = this.Text });
+        }
+
         protected override void OnKeyDown(KeyEventArgs e)
         {
             if (!Multiline)
diff --git a/SunnyUI/Controls/UIGlobal.cs b/SunnyUI/Controls/UIGlobal.cs
index 11a9ae33..21b755b5 100644
--- a/SunnyUI/Controls/UIGlobal.cs
+++ b/SunnyUI/Controls/UIGlobal.cs
@@ -52,5 +52,14 @@ namespace Sunny.UI
         }
     }
 
+    public class UITextBoxSelectionArgs : EventArgs
+    {
+        public int SelectionStart { get; set; }
+
+        public string Text { get; set; }
+    }
+
+    public delegate void OnSelectionChanged(object sender, UITextBoxSelectionArgs e);
+
     public delegate void OnDateTimeChanged(object sender, UIDateTimeArgs e);
 }
\ No newline at end of file
diff --git a/SunnyUI/Controls/UITextBox.cs b/SunnyUI/Controls/UITextBox.cs
index f7298a71..00e781db 100644
--- a/SunnyUI/Controls/UITextBox.cs
+++ b/SunnyUI/Controls/UITextBox.cs
@@ -35,6 +35,7 @@
  * 2022-04-11: V3.1.3 增加对按钮设置ToolTip
  * 2022-06-10: V3.1.9 尺寸改变时重绘
  * 2022-06-23: V3.2.0 重写水印文字，解决不同背景色下泛白的问题
+ * 2022-07-17: V3.2.1 增加SelectionChanged事件
 ******************************************************************************/
 
 using System;
@@ -91,6 +92,7 @@ namespace Sunny.UI
             edit.MouseDown += Edit_MouseDown;
             edit.MouseUp += Edit_MouseUp;
             edit.MouseMove += Edit_MouseMove;
+            edit.SelectionChanged += Edit_SelectionChanged;
 
             btn.Parent = this;
             btn.Visible = false;
@@ -122,6 +124,13 @@ namespace Sunny.UI
             TextAlignmentChange += UITextBox_TextAlignmentChange;
         }
 
+        private void Edit_SelectionChanged(object sender, UITextBoxSelectionArgs e)
+        {
+            SelectionChanged?.Invoke(this, e);
+        }
+
+        public event OnSelectionChanged SelectionChanged;
+
         public void SetButtonToolTip(ToolTip toolTip, string tipText)
         {
             toolTip.SetToolTip(btn, tipText);
diff --git a/SunnyUI/Controls/UITreeView.cs b/SunnyUI/Controls/UITreeView.cs
index af2db2f6..31f0f338 100644
--- a/SunnyUI/Controls/UITreeView.cs
+++ b/SunnyUI/Controls/UITreeView.cs
@@ -87,7 +87,7 @@ namespace Sunny.UI
             view.AfterLabelEdit += View_AfterLabelEdit;
         }
 
-        internal int DrawLeft(TreeNode node)
+        public int DrawLeft(TreeNode node)
         {
             if (view == null || node == null) return 0;
             return view.DrawLeft(node);