ScrollViewer.CanContentScroll not scrolling ItemsControl item by item

Question

I have an ItemControl on a ScrollViewer. I want to scroll item by item, now is scrolling pixel by pixel.

<ScrollViewer Height="299" Margin="10,10,0,0" 
HorizontalScrollBarVisibility="Visible" x:Name="Scroll"
                  VerticalAlignment="Top"  
                  Grid.Column="0" Grid.Row="1" 
                  PanningMode="HorizontalOnly" 
                  CanContentScroll="True">
        <ItemsControl ItemsSource="{Binding RelativeSource={RelativeSource AncestorType=Window}, Path=Items, Mode=OneWay}">
            <ItemsControl.ItemsPanel>
                <ItemsPanelTemplate>
                    <VirtualizingStackPanel Orientation="Horizontal"/>
                </ItemsPanelTemplate>
            </ItemsControl.ItemsPanel>
            <ItemsControl.ItemTemplate>
                <DataTemplate>
                    <Border  Width="175" Height="64" Margin="0,0,16,16" HorizontalAlignment="Center" Focusable="False">
                        <TextBlock Text="{Binding}" HorizontalAlignment="Center" VerticalAlignment="Center"/>
                    </Border>
                </DataTemplate>
            </ItemsControl.ItemTemplate>
        </ItemsControl>
    </ScrollViewer>

Answer 1

I found a solution

<ItemsControl ItemsSource="{Binding TypeHeaders}" 
                                      x:Name="ActivityItemsControl" 
                                      Grid.Column="0" Grid.Row="1">
                            <ItemsControl.Template>
                                <ControlTemplate>
                                    <ScrollViewer HorizontalScrollBarVisibility="Hidden" 
                                                  VerticalScrollBarVisibility="Visible" 
                                                  CanContentScroll="True"                                                       
                                                  x:Name="ActivityScrollViewer">
                                        <ItemsPresenter/>
                                        <i:Interaction.Triggers>
                                            <i:EventTrigger EventName="ScrollChanged">
                                                <cmd:EventToCommand PassEventArgsToCommand="True" 
                                                        Command="{Binding RelativeSource={RelativeSource AncestorType={x:Type Grid}}, Path=DataContext.VmCommands.ActivityScrollChangedCommand}" />
                                            </i:EventTrigger>
                                        </i:Interaction.Triggers>
                                    </ScrollViewer>
                                </ControlTemplate>
                            </ItemsControl.Template>
                            <ItemsControl.ItemTemplate>
                                <DataTemplate>
                                    <Button Content="{Binding Description}" Style="{DynamicResource ZoneTypeHeaderButtonStyle}"
                                                        Command="{Binding RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}, Path=DataContext.VmCommands.ZoneOverviewControlTypeHeaderClickedCommand}"
                                                        CommandParameter="{Binding}"/>
                                </DataTemplate>
                            </ItemsControl.ItemTemplate>
                        </ItemsControl>