Template de combobox avec une ListBox

Bonjour,

J'utilise un template sur une combobox dans laquelle je présente les élements dans une listbox.
Mon problème est que lorsque je sélectionne un élement, la popup ne se ferme pas.
Le même genre de template ou j'utilise un scrollviewer marche très bien, mais j'ai besoin d'une listbox

Voici un petit d'exemple d'illustration:
Code:
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<Page
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <Page.Resources>
        <XmlDataProvider x:Key="MyData"
                         XPath="/Info">
            <x:XData>
                <Info xmlns="">
                    <Item Name="Item 1"
                          Category="Cat1" />
                    <Item Name="Item 2"
                          Category="Cat1" />
                    <Item Name="Item 3"
                          Category="Cat2" />
                    <Item Name="Item 4"
                          Category="Cat2" />
                    <Item Name="Item 5"
                          Category="Cat2" />
                    <Item Name="Item 6"
                          Category="Cat3" />
                </Info>
            </x:XData>
        </XmlDataProvider>
        <CollectionViewSource x:Key='src'
                              Source="{Binding Source={StaticResource MyData}, XPath=Item}">
            <CollectionViewSource.GroupDescriptions>
                <PropertyGroupDescription PropertyName="@Category" />
            </CollectionViewSource.GroupDescriptions>
        </CollectionViewSource>
        <CollectionViewSource x:Key='src2'
                              Source="{Binding Source={StaticResource MyData}, XPath=Item}">
            <CollectionViewSource.GroupDescriptions>
                <PropertyGroupDescription PropertyName="@Category" />
            </CollectionViewSource.GroupDescriptions>
        </CollectionViewSource>
        <ControlTemplate x:Key="CBoxTemplate"
                         TargetType="{x:Type ComboBox}">
            <Grid SnapsToDevicePixels="true"
                  DataContext="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=ItemsSource}">
                <Border x:Name="Bd"
                        Background="{TemplateBinding Background}"
                        BorderBrush="{TemplateBinding BorderBrush}"
                        BorderThickness="{TemplateBinding BorderThickness}"
                        Padding="1">
                    <Grid Grid.IsSharedSizeScope="true">
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="1" />
                            <ColumnDefinition Width="*" />
                            <ColumnDefinition Width="Auto"
                                              SharedSizeGroup="ComboBoxButton" />
                        </Grid.ColumnDefinitions>
                        <Border Margin="{TemplateBinding Padding}"
                                x:Name="SelectedItemBorder"
                                Grid.ColumnSpan="2" />
                        <ContentPresenter HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
                                          Margin="{TemplateBinding Padding}"
                                          VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
                                          Grid.Column="1"
                                          Content="{TemplateBinding SelectionBoxItem}"
                                          ContentTemplateSelector="{TemplateBinding ItemTemplateSelector}" />
                        <ToggleButton Background="Transparent"
                                      Grid.ColumnSpan="3"
                                      IsChecked="{Binding Path=IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}" />
                    </Grid>
                </Border>
                <Popup x:Name="PART_Popup"
                       Focusable="false"
                       AllowsTransparency="true"
                       IsOpen="{Binding Path=IsDropDownOpen, RelativeSource={RelativeSource TemplatedParent}}"
                       Placement="Bottom">
                        <ListView ItemsSource="{TemplateBinding ItemsSource}"
                                 SelectedValuePath="{TemplateBinding SelectedValuePath}"
                                 SelectedValue="{TemplateBinding SelectedValue}"
                                 IsSynchronizedWithCurrentItem="True"
                                 DisplayMemberPath="{TemplateBinding DisplayMemberPath}">
                        </ListView>
                </Popup>
            </Grid>
        </ControlTemplate>
 
        <ControlTemplate x:Key="CBoxTemplate2"
                         TargetType="{x:Type ComboBox}">
            <Grid SnapsToDevicePixels="true"
                  DataContext="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=ItemsSource}">
                <Border x:Name="Bd"
                        Background="{TemplateBinding Background}"
                        BorderBrush="{TemplateBinding BorderBrush}"
                        BorderThickness="{TemplateBinding BorderThickness}"
                        Padding="1">
                    <Grid Grid.IsSharedSizeScope="true">
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="1" />
                            <ColumnDefinition Width="*" />
                            <ColumnDefinition Width="Auto"
                                              SharedSizeGroup="ComboBoxButton" />
                        </Grid.ColumnDefinitions>
                        <Border Margin="{TemplateBinding Padding}"
                                x:Name="SelectedItemBorder"
                                Grid.ColumnSpan="2" />
                        <ContentPresenter HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
                                          Margin="{TemplateBinding Padding}"
                                          VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
                                          Grid.Column="1"
                                          Content="{TemplateBinding SelectionBoxItem}"
                                          ContentTemplateSelector="{TemplateBinding ItemTemplateSelector}" />
                        <ToggleButton Background="Transparent" ClickMode="Press" Focusable="False"
                                      Grid.ColumnSpan="3"
                                      IsChecked="{Binding Path=IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}" />
                    </Grid>
                </Border>
                <Popup x:Name="PART_Popup"
                       Focusable="false"
                       AllowsTransparency="true"
                       IsOpen="{Binding Path=IsDropDownOpen, RelativeSource={RelativeSource TemplatedParent}}"
                       Placement="Bottom">
                    <Border x:Name="DropDownBorder"
                            BorderBrush="{DynamicResource {x:Static SystemColors.WindowFrameBrushKey}}"
                            BorderThickness="1"
                            CornerRadius="5,5,5,5">
                        <ScrollViewer MaxHeight="100"
                                      VerticalScrollBarVisibility="Auto"
                                      Background="White">
                            <ItemsPresenter SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"
                                            KeyboardNavigation.DirectionalNavigation="Contained" />
 
                        </ScrollViewer>
                    </Border>
                </Popup>
            </Grid>
        </ControlTemplate>
    </Page.Resources>
 
    <StackPanel Width="200">
        <ComboBox ItemsSource='{Binding Source={StaticResource src}}'
                  DisplayMemberPath="@Name"
                  BorderThickness="1"
                  Template="{StaticResource CBoxTemplate}" />
        <ComboBox ItemsSource='{Binding Source={StaticResource src2}}'
                  DisplayMemberPath="@Name"
                  BorderThickness="1"
                  Template="{StaticResource CBoxTemplate2}" />
    </StackPanel>
</Page>
Question subsidiaire: comment faire pour que l'élement de la listbox soit "highlighté" lorsque la souris passe dessus (a l'instar d'un élement de scrollviewer.)

Toutes les idées sont les bienvenues