VerticalScrollBarVisibility isn't work?

Hi

<Border Grid.Column="1" Grid.Row="1" CornerRadius="2" BorderBrush="LightGray" BorderThickness="1"><Border.Resources><Style TargetType="{x:Type ListBox}"><Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Hidden"/></Style></Border.Resources><ListBox Style="{Binding Source={StaticResource DesignerItemStyle}}"/></Border>
The following code is okay.
<Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Auto"/>
 

I could not hide the "VerticalScrollBarVisibility"

There's some expression ExpressionDark Thems. Are those the problems?