dozob

<Style TargetType="{x:Type ListBox}">
    <Setter Property="ItemContainerStyle">
        <Setter.Value>
            <Style TargetType="{x:Type ListBoxItem}"
                   BasedOn="{StaticResource ListBoxItemStyle}">
                <Style.Resources>
                    <!-- Background of selected item when not focused -->
                    <SolidColorBrush x:Key="{x:Static SystemColors.InactiveSelectionHighlightBrushKey}"
                                     Color="{DynamicResource ResourceKey={x:Static SystemColors.HighlightColorKey}}"/>
                    <SolidColorBrush x:Key="{x:Static SystemColors.ControlBrushKey}"
                                     Color="{DynamicResource ResourceKey={x:Static SystemColors.HighlightColorKey}}"/>
                </Style.Resources>
                <Style.Triggers>
                    <Trigger Property="IsSelected" Value="True">
                        <Setter Property="Panel.Background"
                                Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"/>
                    </Trigger>
                </Style.Triggers>
            </Style>
        </Setter.Value>
    </Setter>
</Style>