为什么Style不适用于ListBoxItem？

Question

<ListBox>
<ListBox.Resources>
<Style TargetType="{x:Type ListBoxItem}">
                        <Setter Property="ListBoxItem.IsSelected" Value="True"/>
                    </Style>
</ListBox.Resources>
<ListBox>

未选择项目。 http://www.11011.net/archives/000692.html这个语句给出了一些提示，但ListBoxItem属于Control类的继承树。

我了解ItemContainerStyle属性。我只是好奇为什么没有应用风格。

UPDATE1：

它确实适用于ListBox，但不适用于具有默认样式的派生类：

<ResourceDictionary
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:wcl="clr-namespace:SecurityFramework.UI.WpfControlsLibrary">
    <Style TargetType="{x:Type wcl:ListBoxEx}">
        <Setter Property="SelectAllToggleStyle">
            <Setter.Value>
                <Style TargetType="ToggleButton">
                    <Setter Property="Content" Value="Select All"/>
                    <Setter Property="Focusable" Value="True"/>
                    <Setter Property="Margin" Value="2,0,0,0"/>
                    <Setter Property="IsThreeState" Value="False"/>
                </Style>
            </Setter.Value>
        </Setter>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type wcl:ListBoxEx}">
                    <Border 
                            Background="{TemplateBinding Background}"
                            BorderBrush="{TemplateBinding BorderBrush}"
                            BorderThickness="{TemplateBinding BorderThickness}"
                            SnapsToDevicePixels="true"
                            Padding="{TemplateBinding Padding}"
                            VerticalAlignment="{TemplateBinding VerticalAlignment}"
                            HorizontalAlignment="{TemplateBinding HorizontalAlignment}"
                            Height="{TemplateBinding Height}"
                            Width="{TemplateBinding Width}">
                        <DockPanel VerticalAlignment="Top" HorizontalAlignment="Stretch" LastChildFill="True">
                            <CheckBox Name="PART_SelectAllToggle" DockPanel.Dock="Top"/>
                            <Separator Margin="4" Visibility="{Binding Path=Visibility, ElementName=PART_SelectAllToggle}" DockPanel.Dock="Top"/>
                            <ScrollViewer>
                                <ItemsPresenter DockPanel.Dock="Top"/>
                            </ScrollViewer>
                        </DockPanel>
                    </Border>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
        <Setter Property="ItemContainerStyle">
            <Setter.Value>
                <Style>
                    <Setter Property="ListBoxItem.Template">
                        <Setter.Value>
                            <ControlTemplate TargetType="{x:Type ListBoxItem}">
                                <Border
                                SnapsToDevicePixels="true" 
                                Background="{TemplateBinding Background}" 
                                BorderBrush="{TemplateBinding BorderBrush}" 
                                BorderThickness="{TemplateBinding BorderThickness}"
                                Padding="0"
                                VerticalAlignment="{TemplateBinding VerticalAlignment}"
                                HorizontalAlignment="Stretch"
                                Height="{TemplateBinding Height}"
                                Width="{TemplateBinding Width}">

                                    <ContentPresenter HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" 
                                              VerticalAlignment="{TemplateBinding VerticalContentAlignment}" 
                                              SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"
                                              />

                                </Border>
                                <ControlTemplate.Triggers>
                                    <Trigger Property="IsSelected" Value="False">
                                        <Setter Property="Background" Value="{Binding RelativeSource={RelativeSource AncestorType=wcl:ListBoxEx, Mode=FindAncestor}, Path=ItemBackground}"/>
                                        <Setter Property="Foreground" Value="{Binding RelativeSource={RelativeSource AncestorType=wcl:ListBoxEx, Mode=FindAncestor}, Path=ItemForeground}"/>
                                    </Trigger>
                                    <Trigger Property="IsMouseOver" Value="True">
                                        <Setter Property="Background" Value="{x:Static SystemColors.HighlightBrush}"/>
                                    </Trigger>
                                    <Trigger Property="IsSelected" Value="True">
                                        <Setter Property="Background" Value="{Binding RelativeSource={RelativeSource AncestorType=wcl:ListBoxEx, Mode=FindAncestor}, Path=SelectedItemBackground}"/>
                                        <Setter Property="Foreground" Value="{Binding RelativeSource={RelativeSource AncestorType=wcl:ListBoxEx, Mode=FindAncestor}, Path=SelectedItemForeground}"/>
                                    </Trigger>
                                </ControlTemplate.Triggers>
                            </ControlTemplate>
                        </Setter.Value>
                    </Setter>
                    <Setter Property="Control.VerticalAlignment" Value="Center"/>
                    <Setter Property="Control.FocusVisualStyle">
                        <Setter.Value>
                            <Style TargetType="Control">
                                <Setter Property="Template">
                                    <Setter.Value>
                                        <ControlTemplate>
                                            <Rectangle Margin="0" StrokeThickness="2"  Stroke="Black" SnapsToDevicePixels="true"/>
                                        </ControlTemplate>
                                    </Setter.Value>
                                </Setter>
                            </Style>
                        </Setter.Value>
                    </Setter>
                </Style>
            </Setter.Value>
        </Setter>
        <Setter Property="Padding" Value="4"/>
        <Setter Property="SelectedItemBackground" Value="{x:Static SystemColors.HighlightBrush}"/>
        <Setter Property="SelectedItemForeground" Value="White"/>
        <Setter Property="ItemBackground" Value="Transparent"/>
        <Setter Property="ItemForeground" Value="Black"/>
        <Setter Property="MouseOverItemBackground" Value="LightGray"/>
        <Setter Property="MouseOverItemForeground" Value="Black"/>
    </Style>
</ResourceDictionary>

UPDATE2：

并行线程：http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/f7f0558b-c041-492e-bd96-896f97a7b07e/