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    copied!<p>Move DataTemplates from TreeView.Resources to Window.Resources </p> <pre><code> &lt;Window.Resources&gt;&lt;DataTemplate x:Key="DefaultTemplate"&gt; &lt;TextBlock Text="{Binding Header}"&gt;&lt;/TextBlock&gt; &lt;/DataTemplate&gt;&lt;DataTemplate x:Key="Regulation"&gt; &lt;TextBlock Text="{Binding Path=Header}" FontWeight="Bold"&gt;&lt;/TextBlock&gt; &lt;/DataTemplate&gt; &lt;DataTemplate x:Key="Article"&gt; &lt;TextBlock Text="{Binding Path=Header}" Foreground="Green"&gt;&lt;/TextBlock&gt; &lt;/DataTemplate&gt; &lt;local:TreeViewItemTemplateSelector x:Key="TemplateSelector" DefaultTemplate="{StaticResource DefaultTemplate}" ArticleTemplate="{StaticResource Article}" RegulationTemplate="{StaticResource Regulation}" /&gt; </code></pre> <p>and make change</p> <pre><code> &lt;TreeView ItemTemplateSelector="{StaticResource TemplateSelector}" Height="409" HorizontalAlignment="Left" Margin="10,10,0,0" Name="treeView1" VerticalAlignment="Top" Width="277" ItemsSource="{Binding}"/&gt; </code></pre> <p>Update code and we will see. I put similar code into VS and it works so we need to take a closer look. So i checked this and changed</p> <pre><code>public class TreeViewCustomItem { public string Header { get; set; } } </code></pre> <p>and this</p> <pre><code> listmy = new ObservableCollection&lt;TreeViewCustomItem&gt; { new TreeViewCustomItem { Header = "xD" }, new TreeViewCustomItem { Header = "xxD" } }; //treeView1.ItemsSource = listmy; this.DataContext = listmy; public class selector : DataTemplateSelector { public DataTemplate RegulationTemplate { get; set; } public DataTemplate DefaultTemplate { get; set; } public override DataTemplate SelectTemplate(object item, DependencyObject container) { TreeViewCustomItem treeViewItem = item as TreeViewCustomItem; if (treeViewItem.Header == "xD") { return RegulationTemplate; } else { return DefaultTemplate; } } } </code></pre> <p>and in XAML looks like this</p> <pre><code> xmlns:local="clr-namespace:WpfApplication1.Views"&gt; &lt;Window.Resources&gt; &lt;DataTemplate x:Key="DefaultTemplate"&gt; &lt;TextBlock Text="{Binding Header}"&gt;&lt;/TextBlock&gt; &lt;/DataTemplate&gt; &lt;DataTemplate x:Key="Regulation"&gt; &lt;TextBlock Text="{Binding Path=Header}" FontWeight="Bold"&gt;&lt;/TextBlock&gt; &lt;/DataTemplate&gt; &lt;local:selector x:Key="selector_" DefaultTemplate="{StaticResource DefaultTemplate}" RegulationTemplate="{StaticResource Regulation}"/&gt; &lt;/Window.Resources&gt; &lt;Grid&gt; &lt;TreeView Height="409" HorizontalAlignment="Left" Margin="10,10,0,0" Name="treeView1" VerticalAlignment="Top" Width="277" ItemsSource="{Binding}" ItemTemplateSelector="{StaticResource selector_}"/&gt; &lt;/Grid&gt; </code></pre> <p>And it works so my presumption is that problem is inside TreeViewCustomItem.</p>
 

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