如何在TreeView中包裹TextBlock内容？

I have TreeView，它使用数据模板显示一些数据。这是 XAML：

<TreeView Grid.Row="0" ItemsSource="{Binding Railways}" x:Name="tvDatawareObjects"
          ScrollViewer.HorizontalScrollBarVisibility="Disabled">
    <TreeView.ItemContainerStyle>
        <Style TargetType="{x:Type TreeViewItem}">
            <Setter Property="IsSelected" Value="{Binding IsSelected, Mode=TwoWay}" />
            <Setter Property="IsExpanded" Value="{Binding IsExpanded, Mode=TwoWay}" />
        </Style>
    </TreeView.ItemContainerStyle>
    <TreeView.Resources>
        <!-- other templates here... -->
        <HierarchicalDataTemplate DataType="{x:Type viewModels:ProjectViewModel}" ItemsSource="{Binding Phases}">
            <Grid>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="*"/>
                </Grid.ColumnDefinitions>
                <Grid.RowDefinitions>
                    <RowDefinition />
                    <RowDefinition Height="*" />
                </Grid.RowDefinitions>
                <TextBlock Text="{Binding Model.Code}" FontWeight="DemiBold" />
                <TextBlock Text="{Binding Model.Title}" TextWrapping="Wrap" Foreground="Gray" Grid.Row="1" />
            </Grid>
        </HierarchicalDataTemplate>

        <HierarchicalDataTemplate DataType="{x:Type viewModels:CollectionViewModel}" ItemsSource="{Binding Items}">
            <TextBlock Text="{Binding CollectionName}" />
        </HierarchicalDataTemplate>
    </TreeView.Resources>
</TreeView>

文本换行<TextBlock Text="{Binding Model.Title}" TextWrapping="Wrap" Foreground="Gray" Grid.Row="1" />不起作用。我究竟做错了什么？

我相信TextBlock没有换行，因为它没有定义的宽度。网格列TextBlock具有 * 宽度，该宽度将随着TextBlock宽度增长。尝试设置宽度TextBlock或列，看看更改是否会导致TextBlock包裹。

Update:

更具体地说，问题在于TreeViewItem将根据其内容的大小调整自身大小，ColumnDefinition将填充（无限）可用空间并且TextBlock，没有宽度限制，永远不会换行。这个帖子很好地描述了 TreeViewItem 的行为方式。总结一下：内容领域TreeViewItem设置为“自动”，因此它将增长以适应内容。显式设置宽度TreeViewItem尝试绑定你的ColumnDefinition宽度到TreeView's ActualWidth.

XAML:

<TreeView Width="100">
    <TreeViewItem>
        <Grid>
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="{Binding RelativeSource={RelativeSource AncestorType=TreeView}, Path=ActualWidth}"/>
            </Grid.ColumnDefinitions>
            <Grid.RowDefinitions>
                <RowDefinition/>
                <RowDefinition/>
            </Grid.RowDefinitions>
            <TextBlock Text="Lorem Ipsum" />
            <TextBlock Text="Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book." 
                       TextWrapping="Wrap" Grid.Row="1"/>
            </Grid>
        </TreeViewItem>
    </TreeView>