From 55c8009f05cd358b53b401e9c0a7bce9acfbb5e5 Mon Sep 17 00:00:00 2001
From: Sunny <yhuse@163.com>
Date: Sun, 15 May 2022 14:45:40 +0800
Subject: [PATCH] =?UTF-8?q?*=20UITreeView:=20=E4=BF=AE=E5=A4=8D=E4=BA=86?=
 =?UTF-8?q?=E4=B8=80=E4=B8=AA=E8=AE=BE=E8=AE=A1=E6=9C=9F=E6=98=BE=E7=A4=BA?=
 =?UTF-8?q?=E9=94=99=E8=AF=AF?=
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---
 SunnyUI/Controls/UITreeView.cs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/SunnyUI/Controls/UITreeView.cs b/SunnyUI/Controls/UITreeView.cs
index 06ad26d7..26d152f8 100644
--- a/SunnyUI/Controls/UITreeView.cs
+++ b/SunnyUI/Controls/UITreeView.cs
@@ -25,6 +25,7 @@
  * 2022-03-19: V3.1.1 重构主题配色
  * 2022-04-01: V3.1.2 增加水平滚动条
  * 2022-04-01: V3.1.2 自定义行颜色，可通过代码给颜色值，SetNodePainter
+ * 2022-05-15: V3.1.8 修复了一个设计期显示错误
 ******************************************************************************/
 
 using System;
@@ -1083,7 +1084,7 @@ namespace Sunny.UI
                     return;
                 }
 
-                if (!Bar.Visible)
+                if (Bar != null && !Bar.Visible)
                 {
                     if (m.Msg == 522)
                     {