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Код

<Style x:Key="{x:Type ListBox}" TargetType="ListBox">
  <Setter Property="SnapsToDevicePixels" Value="true"/>
  <Setter Property="OverridesDefaultStyle" Value="true"/>
  <Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Auto"/>
  <Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Auto"/>
  <Setter Property="ScrollViewer.CanContentScroll" Value="true"/>
  <Setter Property="MinWidth" Value="120"/>
  <Setter Property="MinHeight" Value="95"/>
  <Setter Property="Template">
    <Setter.Value>
      <ControlTemplate TargetType="ListBox">
        <Border 
          Name="Border" 
          Background="{StaticResource WindowBackgroundBrush}"
          BorderBrush="{StaticResource SolidBorderBrush}"
          BorderThickness="1"
          CornerRadius="2">
          <ScrollViewer 
            Margin="0"
            Focusable="false">
            <StackPanel Margin="2" IsItemsHost="True" />
          </ScrollViewer>
        </Border>
        <ControlTemplate.Triggers>
          <Trigger Property="IsEnabled" Value="false">
            <Setter TargetName="Border" Property="Background"
                    Value="{StaticResource DisabledBackgroundBrush}" />
            <Setter TargetName="Border" Property="BorderBrush"
                    Value="{StaticResource DisabledBorderBrush}" />
          </Trigger>
          <Trigger Property="IsGrouping" Value="true">
            <Setter Property="ScrollViewer.CanContentScroll" Value="false"/>
          </Trigger>
        </ControlTemplate.Triggers>
      </ControlTemplate>
    </Setter.Value>
  </Setter>
</Style>

<Style x:Key="{x:Type ListBoxItem}" TargetType="ListBoxItem">
  <Setter Property="SnapsToDevicePixels" Value="true"/>
  <Setter Property="OverridesDefaultStyle" Value="true"/>
  <Setter Property="Template">
    <Setter.Value>
      <ControlTemplate TargetType="ListBoxItem">
        <Border 
          Name="Border"
          Padding="2"
          SnapsToDevicePixels="true">
          <ContentPresenter />
        </Border>
        <ControlTemplate.Triggers>
          <!-- Вот этот триггер нужно убрать -->
          <Trigger Property="IsSelected" Value="true">
            <Setter TargetName="Border" Property="Background"
                    Value="{StaticResource SelectedBackgroundBrush}"/>
          </Trigger>
          <Trigger Property="IsEnabled" Value="false">
            <Setter Property="Foreground"
                    Value="{StaticResource DisabledForegroundBrush}"/>
          </Trigger>
        </ControlTemplate.Triggers>
      </ControlTemplate>
    </Setter.Value>
  </Setter>
</Style>