Wpf中如何让textblock自动换行

<Style x:Key="RepliceMessageStyle" TargetType="TextBlock">

            <Setter Property="HorizontalAlignment" Value="Left"></Setter>

            <Setter Property="FontSize" Value="12"></Setter>

            <Setter Property="Foreground" Value="White"></Setter>

            <Setter Property="Margin" Value="10,5,0,0"></Setter>

            <Setter Property="TextWrapping" Value="Wrap"></Setter>

            <Setter Property="MaxWidth" Value="200"></Setter>

</Style>