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    copied!<p>Here's how I ended up solving this:</p> <ol> <li><p>As I thought initially, giving each item both a GroupID and a GroupName worked out pretty well. The IDs remained unique, but the groups were displayed as:</p> <pre><code> &lt;ListView.GroupStyle&gt; &lt;GroupStyle&gt; &lt;GroupStyle.ContainerStyle&gt; &lt;Style TargetType="{x:Type GroupItem}"&gt; &lt;Setter Property="Margin" Value="1,1,1,10"/&gt; &lt;Setter Property="Template"&gt; &lt;Setter.Value&gt; &lt;ControlTemplate TargetType="{x:Type GroupItem}"&gt; &lt;Grid&gt; &lt;Rectangle Grid.ColumnSpan="4" Margin="0,0,0,0" Fill="{Binding Path=Items[0].GroupBackground}" Stroke="#FF808080" RadiusX="6" RadiusY="6" /&gt; &lt;Expander IsExpanded="True"&gt; &lt;Expander.Header&gt; &lt;DockPanel&gt; &lt;TextBlock FontSize="14" Text="{Binding Path=Items[0].GroupName}" Margin="5,0,0,0" HorizontalAlignment="Stretch"/&gt; &lt;/DockPanel&gt; &lt;/Expander.Header&gt; &lt;Expander.Content&gt; &lt;ItemsPresenter /&gt; &lt;/Expander.Content&gt; &lt;/Expander&gt; &lt;/Grid&gt; &lt;/ControlTemplate&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;/Style&gt; &lt;/GroupStyle.ContainerStyle&gt; &lt;/GroupStyle&gt; &lt;/ListView.GroupStyle&gt; </code></pre></li> <li><p>I found that the only styling I really needed to do on the group was the overall background color. I created another property on the items for use by the group. I accessed it with:</p> <pre><code>Fill="{Binding Path=Items[0].GroupBackground}" </code></pre></li> </ol> <p>Perhaps not the best approach (lots of duplication of the GroupName and GroupBackground data), but it worked for me.</p>
 

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