From b3630ceff868af33a0248c9dcf543f77cba7824b Mon Sep 17 00:00:00 2001
From: Zihan Chen <vczh@163.com>
Date: Mon, 22 May 2017 22:14:40 -0700
Subject: [PATCH] ...

---
 Tutorial/GacUI_Controls/TextEditor/UI/MainWindow.xml | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Tutorial/GacUI_Controls/TextEditor/UI/MainWindow.xml b/Tutorial/GacUI_Controls/TextEditor/UI/MainWindow.xml
index f715e848..5609f3b3 100644
--- a/Tutorial/GacUI_Controls/TextEditor/UI/MainWindow.xml
+++ b/Tutorial/GacUI_Controls/TextEditor/UI/MainWindow.xml
@@ -56,11 +56,11 @@
     </ToolstripCommand>
 
     <ToolstripCommand ref.Name="commandEditUndo" Text="Undo" Image-uri="res://Images/EditUndo.png" ShortcutBuilder="Ctrl+Z">
-      <att.Enabled-bind>textBox.observe as _(_.CanUndo() on _.SelectionChanged)</att.Enabled-bind>
+      <att.Enabled-bind>textBox.observe as _(_.CanUndo() on _.UndoRedoChanged)</att.Enabled-bind>
       <ev.Executed>commandEditUndo_Executed</ev.Executed>
     </ToolstripCommand>
     <ToolstripCommand ref.Name="commandEditRedo" Text="Redo" Image-uri="res://Images/EditRedo.png" ShortcutBuilder="Ctrl+Y">
-      <att.Enabled-bind>textBox.observe as _(_.CanRedo() on _.SelectionChanged)</att.Enabled-bind>
+      <att.Enabled-bind>textBox.observe as _(_.CanRedo() on _.UndoRedoChanged)</att.Enabled-bind>
       <ev.Executed>commandEditRedo_Executed</ev.Executed>
     </ToolstripCommand>
     <ToolstripCommand ref.Name="commandEditCut" Text="Cut" Image-uri="res://Images/EditCut.png" ShortcutBuilder="Ctrl+X">