/// 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