How can a separator be added between items in an ItemsControl

by 
<ItemsControl ItemsSource="{Binding Numbers}">
    <ItemsControl.ItemsPanel>
        <ItemsPanelTemplate>
            <!-- could use a WrapPanel if more appropriate for your scenario -->
            <StackPanel Orientation="Horizontal"/>
        </ItemsPanelTemplate>
    </ItemsControl.ItemsPanel>
    <ItemsControl.ItemTemplate>
        <DataTemplate>
            <StackPanel Orientation="Horizontal">
                <TextBlock x:Name="commaTextBlock" Text=", "/>
                <TextBlock Text="{Binding .}"/>
            </StackPanel>
            <DataTemplate.Triggers>
                <DataTrigger Binding="{Binding RelativeSource={RelativeSource PreviousData}}" Value="{x:Null}">
                    <Setter Property="Visibility" TargetName="commaTextBlock" Value="Collapsed"/>
                </DataTrigger>
            </DataTemplate.Triggers>
        </DataTemplate>

    </ItemsControl.ItemTemplate>
</ItemsControl>

I arrived at your question because I was looking for a solution in Silverlight, which does not have a previous data relative source.

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