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POWPF TreeView - Group Nodes Style
 

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    <p>I have a list of type IList called groups and each group has a sub list of Type IList called items. Both Group and Item have property called Name. To display this hierarchy i'm using a TreeView.</p> <p>I want to display each group in the hierarchy as an Expander, however it's not displaying as i want to.</p> <p>So far my xaml:</p> <pre><code>&lt;DataTemplate x:Key="NavItemTemplate"&gt; &lt;TextBlock Text="{Binding Name}"/&gt; &lt;/DataTemplate&gt; &lt;HierarchicalDataTemplate x:Key="NavGroupTemplate" ItemsSource="{Binding Items}" ItemTemplate="{StaticResource NavItemTemplate}"&gt; &lt;TextBlock Text="{Binding Name}"/&gt; &lt;/HierarchicalDataTemplate&gt; &lt;Style x:Key="RootItemStyle" TargetType="{x:Type TreeViewItem}"&gt; &lt;Setter Property="IsExpanded" Value="True"/&gt; &lt;Setter Property="Template"&gt; &lt;Setter.Value&gt; &lt;ControlTemplate TargetType="TreeViewItem"&gt; &lt;Grid&gt; &lt;Expander x:Name="Exp" TextElement.FontWeight="Bold" IsExpanded="{TemplateBinding TreeViewItem.IsExpanded}"&gt; &lt;Expander.Header&gt; &lt;ContentPresenter x:Name="ExpCP" ContentSource="Header"/&gt; &lt;/Expander.Header&gt; &lt;ItemsPresenter/&gt; &lt;/Expander&gt; &lt;Border x:Name="CP" Padding="25,0,0,0" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Visibility="Collapsed"&gt; &lt;ContentPresenter ContentSource="Header" HorizontalAlignment="Left" VerticalAlignment="Center" /&gt; &lt;/Border&gt; &lt;/Grid&gt; &lt;ControlTemplate.Triggers&gt; &lt;Trigger Property="HasItems" Value="false"&gt; &lt;Setter TargetName="Exp" Property="Visibility" Value="Collapsed"/&gt; &lt;Setter TargetName="CP" Property="Visibility" Value="Visible" /&gt; &lt;/Trigger&gt; &lt;Trigger Property="IsSelected" Value="True"&gt; &lt;Setter Property="Background" Value="Red"/&gt; &lt;/Trigger&gt; &lt;/ControlTemplate.Triggers&gt; &lt;/ControlTemplate&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;/Style&gt; &lt;TreeView ItemsSource="{Binding}" ItemTemplate="{StaticResource NavGroupTemplate}" ItemContainerStyle="{StaticResource RootItemStyle}"&gt; </code></pre> <p>The above style </p> <p>works for:</p> <p>Group1 (expander)</p> <ul> <li>Item1</li> </ul> <p>Group2 (expander)</p> <p>...</p> <p>but doesn't work for (the goal):</p> <p>Group1 (expander)</p> <ul> <li><p>Item1</p> <ul> <li>SubItem1</li> </ul></li> </ul> <p>Group2 (expander)</p> <p>...</p> <p>Also the above style also needs further correction. When i select the expander border side it triggers a selecteditem event, which should be prevented.</p>
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    1. COI have the similar issue. I have collection of dates groued by years and months. Is it possible to expand whole path to the date, when IsExpanded property is set to true?
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