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    <p>OK, so thanks to <a href="http://chat.stackoverflow.com/rooms/18165/wpf">@Maverik</a> I managed to do the following to solve this (I'll paste the whole code again...)</p> <p><strong>XAML</strong></p> <pre><code>&lt;Window x:Class="TreeViewSortingWithXmlDataProvider.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:l="clr-namespace:TreeViewSortingWithXmlDataProvider" Title="MainWindow" Height="350" Width="525"&gt; &lt;Window.Resources&gt; &lt;l:MyConverter x:Key="myConverter" /&gt; &lt;HierarchicalDataTemplate DataType="Header" ItemsSource="{Binding XPath=Header|Group|Item}"&gt; &lt;TextBlock Text="{Binding XPath=@Name}" Margin="3,0,0,0" /&gt; &lt;/HierarchicalDataTemplate&gt; &lt;HierarchicalDataTemplate DataType="Group" ItemsSource="{Binding XPath=Item, Converter={StaticResource myConverter}, ConverterParameter=sortPos}"&gt; &lt;TextBlock Text="{Binding XPath=@Name, Mode=TwoWay}" Margin="3,0,0,0" /&gt; &lt;HierarchicalDataTemplate.ItemTemplate&gt; &lt;DataTemplate&gt; &lt;TextBlock Text="{Binding XPath=@Name}" /&gt; &lt;/DataTemplate&gt; &lt;/HierarchicalDataTemplate.ItemTemplate&gt; &lt;/HierarchicalDataTemplate&gt; &lt;/Window.Resources&gt; &lt;DockPanel &gt; &lt;Button DockPanel.Dock="Bottom" Content="click" Click="Button_Click" /&gt; &lt;TreeView Name="myTreeView"/&gt; &lt;/DockPanel&gt; &lt;/Window&gt; </code></pre> <p><strong>And the code-behind</strong> (with the Converter)</p> <pre><code>using System; using System.Windows; using System.Windows.Controls; using System.Windows.Data; using System.Xml.Linq; using System.Xml; using System.ComponentModel; using System.Globalization; namespace TreeViewSortingWithXmlDataProvider { /// &lt;summary&gt; /// Interaction logic for MainWindow.xaml /// &lt;/summary&gt; public partial class MainWindow : Window { public MainWindow() { InitializeComponent(); XmlDocument xmlDoc = new XmlDocument(); XDocument xDoc = new XDocument( new XDeclaration("1.0", "utf-8", "yes"), new XComment("Test of sorting"), new XElement("Header", new XAttribute("Name", "Header"))); XElement groupElementA = new XElement("Group", new XAttribute("Name", "A")); XElement groupElementB = new XElement("Group", new XAttribute("Name", "B")); XElement item1 = new XElement("Item", new XAttribute("Name", "TestItem1"), new XAttribute("sortPos", "3")); XElement item2 = new XElement("Item", new XAttribute("Name", "TestItem0"), new XAttribute("sortPos", "2")); XElement item3 = new XElement("Item", new XAttribute("Name", "TestItem3"), new XAttribute("sortPos", "1")); XElement item4 = new XElement("Item", new XAttribute("Name", "TestItem4"), new XAttribute("sortPos", "0")); XElement item5 = new XElement("Item", new XAttribute("Name", "TestItem5"), new XAttribute("sortPos", "2")); groupElementA.Add(item1); groupElementA.Add(item2); groupElementA.Add(item3); groupElementB.Add(item4); groupElementB.Add(item5); xDoc.Element("Header").Add(groupElementA); xDoc.Element("Header").Add(groupElementB); xmlDoc.LoadXml(xDoc.ToString()); XmlDataProvider provider = new XmlDataProvider() { Document = xmlDoc, XPath = "Header" }; this.myTreeView.SetBinding(TreeView.ItemsSourceProperty, new Binding() { Source = provider }); } private void Button_Click(object sender, RoutedEventArgs e) { this.myTreeView.Items.SortDescriptions.Clear(); this.myTreeView.Items.SortDescriptions.Add(new SortDescription("@Name", ListSortDirection.Descending)); } } public class MyConverter : IValueConverter { public object Convert(object value, Type targetType, object parameter, CultureInfo culture) { System.Collections.IList collection = value as System.Collections.IList; ListCollectionView view = new ListCollectionView(collection); SortDescription sort = new SortDescription(parameter.ToString(), ListSortDirection.Ascending); view.SortDescriptions.Add(sort); return view; } public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) { return null; } } } </code></pre> <p>(Sorry for the rather long example, but was easier then to explain every changes I made)</p> <p>If you have any other solution please add it!</p>
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Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

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