diff --git a/SunnyUI/Controls/UIMenuButton.cs b/SunnyUI/Controls/UIMenuButton.cs
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+++ b/SunnyUI/Controls/UIMenuButton.cs
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+/******************************************************************************
+ * SunnyUI 开源控件库、工具类库、扩展类库、多页面开发框架。
+ * CopyRight (C) 2012-2024 ShenYongHua(沈永华).
+ * QQ群：56829229 QQ：17612584 EMail：SunnyUI@QQ.Com
+ *
+ * Blog:   https://www.cnblogs.com/yhuse
+ * Gitee:  https://gitee.com/yhuse/SunnyUI
+ * GitHub: https://github.com/yhuse/SunnyUI
+ *
+ * SunnyUI.dll can be used for free under the GPL-3.0 license.
+ * If you use this code, please keep this note.
+ * 如果您使用此代码，请保留此说明。
+ ******************************************************************************
+ * 文件名称: UIMenuButton.cs
+ * 文件说明: 下拉菜单按钮
+ * 当前版本: V3.8
+ * 创建日期: 2024-12-16
+ *
+ * 2024-12-16: V3.8.0 增加文件说明
+******************************************************************************/
+
+using System.ComponentModel;
+using System.Drawing;
+using System.Windows.Forms;
+
+namespace Sunny.UI
+{
+    [DefaultEvent("Click")]
+    [DefaultProperty("Text")]
+    public class UIMenuButton : UISymbolButton
+    {
+        private bool _showDropArrow = true;
+        public UIContextMenuStrip Menu { get; set; }
+
+        protected override void OnMouseClick(MouseEventArgs e)
+        {
+            base.OnMouseClick(e);
+            Menu?.Show(this, 0, Height);
+        }
+
+        protected override void OnPaint(PaintEventArgs e)
+        {
+            base.OnPaint(e);
+            if (ShowDropArrow)
+            {
+                e.Graphics.DrawFontImage(61703, SymbolSize, GetForeColor(), new Rectangle(Width - SymbolSize - 4, 0, SymbolSize, Height));
+            }
+        }
+
+        /// <summary>
+        /// 字体图标
+        /// </summary>
+        [DefaultValue(true)]
+        [Description("显示下拉按钮"), Category("SunnyUI")]
+        public bool ShowDropArrow
+        {
+            get => _showDropArrow;
+            set
+            {
+                _showDropArrow = value;
+                Invalidate();
+            }
+        }
+    }
+}