WPF. Scroll ListBox by item - wpf

Question

I have listbox where are icons and I have to scroll this listbox by item (now it is scrolling by pixel's). I try to use ScrollViewer.CanContentScroll but it does not work. I think it is problem with WrapPanel
ListBox example:
My xaml:
<Style TargetType="ListBox">
<Setter Property="Height" Value="490"/>
<Setter Property="Width" Value="968"/>
<Setter Property="Margin" Value="30,98,362,135"/>
<Setter Property="Padding" Value="5,25,0,27"></Setter>
<Setter Property="VerticalAlignment" Value="Top"/>
<Setter Property="HorizontalAlignment" Value="Left"/>
<Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Visible"/>
<Setter Property="ItemsPanel">
<Setter.Value>
<ItemsPanelTemplate>
<WrapPanel IsItemsHost="True" />
</ItemsPanelTemplate>
</Setter.Value>
</Setter>
</Style>
<Style TargetType="ListBoxItem">
<Setter Property="BorderThickness" Value="5"/>
<Setter Property="BorderBrush" Value="Black"/>
<Setter Property="Margin" Value="3,3,0,0"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ListBoxItem}">
<Border x:Name="backgroundBorder" Width="Auto">
<ContentPresenter>
<ContentPresenter.ContentTemplate>
<DataTemplate>
<Grid Width="170" Height="212" Background="Transparent">
<Grid.RowDefinitions>
<RowDefinition Height="auto" />
<RowDefinition Height="auto" />
</Grid.RowDefinitions>
<Image Grid.Row="0" Source="{Binding Path=Image}" Stretch="UniformToFill" />
<Label Grid.Row="1" Margin="0,14,0,0" Content="{Binding Path=Title}" HorizontalAlignment="Center"
FontFamily="Arial" FontSize="18" FontWeight="Normal" Foreground="#3F3E3E"/>
</Grid>
</DataTemplate>
</ContentPresenter.ContentTemplate>
</ContentPresenter>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<ListBox ItemsSource="{Binding Path=MyImages, ElementName=window1}"
ScrollViewer.CanContentScroll="True"
ScrollViewer.HorizontalScrollBarVisibility="Disabled"
ScrollViewer.VerticalScrollBarVisibility="Visible"/>