* UINavMenu：更改一個消息事件

SunnyUI/Controls/UINavMenu.cs

@@ -21,6 +21,7 @@
  * 2020-03-12: V3.0.2 增加设置二级菜单底色
 ******************************************************************************/
 
+using Sunny.UI.Win32;
 using System;
 using System.Collections.Concurrent;
 using System.ComponentModel;
@@ -785,9 +786,17 @@ namespace Sunny.UI
 
         protected override void WndProc(ref Message m)
         {
-            base.WndProc(ref m);
             if (IsDisposed || Disposing) return;
-            Win32.User.ShowScrollBar(Handle, 3, false);
+
+            switch (m.Msg)
+            {
+                case User.WM_ERASEBKGND:
+                    Win32.User.ShowScrollBar(Handle, 3, false);
+                    break;
+                default:
+                    base.WndProc(ref m);
+                    break;
+            }
         }
 
         public TreeNode CreateNode(string text, int pageIndex)

SunnyUI/Controls/UIScrollingText.cs

@@ -114,10 +114,10 @@ namespace Sunny.UI
             }
         }
 
-        protected override void OnClick(EventArgs e)
+        protected override void OnMouseDoubleClick(MouseEventArgs e)
         {
             timer.Enabled = !timer.Enabled;
-            base.OnClick(e);
+            base.OnMouseDoubleClick(e);
         }
 
         protected override void OnPaintFore(Graphics g, GraphicsPath path)