WPFTreeviewItem

<pre name="code" class="html"><HierarchicalDataTemplate x:Key="dtTreeView" ItemsSource="{Binding Children}">
        <TextBlock Text="{Binding Name}" />
    </HierarchicalDataTemplate>

<Style x:Key="stTreeViewItem" TargetType="TreeViewItem">
        <Setter Property="IsExpanded" Value="{Binding IsExpanded, Mode=TwoWay}" />
        <Setter Property="IsSelected"  Value="{Binding IsSelected, Mode=TwoWay}" />
        <Setter Property="FontWeight" Value="Normal" />
        <Style.Triggers>
            <Trigger Property="IsSelected" Value="True">
                <Setter Property="FontWeight" Value="Bold" />
            </Trigger>
        </Style.Triggers>
</Style>

<TreeView ItemTemplate="{StaticResource dtTreeView}"
                  ItemsSource="{Binding Path=Nodes.Children}"
                  ItemContainerStyle="{StaticResource stTreeViewItem}"/>