ナレーター起動時に落ちるバグを修正した

diff --git a/Metro/FooEditEngine/FooTextBox.cs b/Metro/FooEditEngine/FooTextBox.cs
index 8d422ab..ad25ffc 100644 (file)
--- a/Metro/FooEditEngine/FooTextBox.cs
+++ b/Metro/FooEditEngine/FooTextBox.cs
@@ -1323,7 +1323,7 @@ namespace FooEditEngine.Metro
         /// Selectionの依存プロパティを表す
         /// </summary>
         public static readonly DependencyProperty SelectionProperty =
-            DependencyProperty.Register("Selection", typeof(TextRange), typeof(FooTextBox), new PropertyMetadata(0, OnPropertyChanged));
+            DependencyProperty.Register("Selection", typeof(TextRange), typeof(FooTextBox), new PropertyMetadata(TextRange.Null, OnPropertyChanged));
 
         /// <summary>
         /// 拡大率を表す