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copied!<p>The <a href="http://msdn.microsoft.com/en-us/library/system.windows.controls.validation.errortemplate.aspx" rel="nofollow noreferrer">Validation.ErrorTemplate</a> property expects a <code>ControlTemplate</code> and no <code>UserControl</code>. That's why your code is not working. You should better keep your "ValidationErrorTemplate" and put it in a shared <code>ResourceDictionary</code> which you can access everywhere in your application (or where you need it). For example, you could put it in your <strong>App.xaml</strong> and then reference it using a <code>DynamicResource</code>.</p> <hr> <p><strong>EDIT:</strong> OK, here we go with a more detailed explanation. Unless it is a requirement, I think you would better work with XAML instead of too much code loading ResourceDictionaries and assigning properties. You can easily achieve the desired behavior in XAML like this:</p> <p>Open the file called "App.xaml" in your WPF application project. Visual Studio/Blend will create that file automatically for you. This file contains a section <code><Application.Resources></code>. Add your ControlTemplate to this section:</p> <pre><code><Application.Resources> <ControlTemplate x:Key="ValidationErrorTemplate"> <StackPanel Orientation="Horizontal" HorizontalAlignment="Right"> <AdornedElementPlaceholder/> <Image Name="ValidizorImage" Stretch="None" Source="validizor.gif" ToolTip="{Binding [0].ErrorContent}" ToolTipService.InitialShowDelay="0" ToolTipService.ShowDuration="60000"/> </StackPanel> </ControlTemplate> </Application.Resources> </code></pre> <p>Now, simply assign this error template to your controls using the <code>Validation.ErrorTemplate</code> property like this:</p> <pre><code><TextBox ... Validation.ErrorTemplate="{DynamicResource ValidationErrorTemplate}" /> </code></pre> <p>Of course, you must have a Binding with ValidationRules defined for the respective properties on the control (e.g. the <code>Text</code> property of a TextBox). In a simple app, this code works for me: The image is displayed if the validation fails.</p> <p>I am not an expert in doing all this in code as I highly prefer XAML to define the UI. But as far as I can say, your code looks OK to me. Does the validation really fail? Check that by removing the Validation.ErrorTemplate. If your TextBox gets a red border, then it does fail - otherwise there might be an error in your validation logic?!</p> <p>HTH, gehho.</p>

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