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    <p>Since the validation error template is set to display over an entire control, you just need to adjust the bindings on your data template so that the validation error template displays over the TextBlock inside the template, rather than the entire HeaderedContentControl.</p> <p>I built a tiny app to demonstrate this. Here's the code:</p> <p><strong>The Window's XAML</strong></p> <pre><code>&lt;Window x:Class="_15001777.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="clr-namespace:_15001777" Title="MainWindow" Width="525" Height="350"&gt; &lt;Grid&gt; &lt;ItemsControl ItemsSource="{Binding Path=Items}"&gt; &lt;ItemsControl.ItemTemplate&gt; &lt;DataTemplate DataType="{x:Type local:HeaderedItem}"&gt; &lt;HeaderedContentControl Header="{Binding Path=Header}"&gt; &lt;HeaderedContentControl.HeaderTemplate&gt; &lt;DataTemplate&gt; &lt;StackPanel Orientation="Horizontal"&gt; &lt;Label VerticalAlignment="Center" HorizontalContentAlignment="Right" Content="Name" /&gt; &lt;TextBlock VerticalAlignment="Center" Text="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=HeaderedContentControl}, Path=DataContext.Header, ValidatesOnDataErrors=True}" /&gt; &lt;/StackPanel&gt; &lt;/DataTemplate&gt; &lt;/HeaderedContentControl.HeaderTemplate&gt; &lt;/HeaderedContentControl&gt; &lt;/DataTemplate&gt; &lt;/ItemsControl.ItemTemplate&gt; &lt;/ItemsControl&gt; &lt;/Grid&gt; &lt;/Window&gt; </code></pre> <p><strong>The Window's Code-Behind</strong></p> <pre><code>using System.Collections.ObjectModel; using System.ComponentModel; using System.Windows; namespace _15001777 { /// &lt;summary&gt; /// Interaction logic for MainWindow.xaml /// &lt;/summary&gt; public partial class MainWindow : Window { public MainWindow() { InitializeComponent(); DataContext = this; Items = new ObservableCollection&lt;object&gt;(); Items.Add(new HeaderedItem { Header = "One" }); } public ObservableCollection&lt;object&gt; Items { get; private set; } } public class HeaderedItem : IDataErrorInfo { public object Header { get; set; } public string this[string columnName] { get { return columnName == "Header" ? "There was an error!" : null; } } public string Error { get; private set; } } } </code></pre>
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    1. POHow to display Error message on content part of Headered Content Control in wpf
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    1. USBrandon Baker
    1. USBrandon Baker
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    1. COBrandon : Thanks for the response & Example.. Will use this and try to check for the possibilities of separating my header part and Content part.. By the way Is there any possibility of achieving it with out changing my Xaml code and by only changing my styles (Property="Validation.ErrorTemplate") to apply styles only to content part of header control....
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    2. COI believe there is a way to do this using only styles, but it would be a lot more complicated. Data templates were created for scenarios just like the one you described, so I'd highly recommend going that route as it will be easier for people following your work to understand.
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      1. USBrandon Baker
 

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