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    copied!<p>Need to put where the resource is coming from.</p> <pre><code>&lt;TextBox Style="{StaticResource textStyleTextBox}"/&gt; </code></pre> <p>Then define the style in a resource such as the user control resources:</p> <pre><code>&lt;UserControl.Resources&gt; &lt;Style TargetType="TextBox" x:Key="textStyleTextBox"&gt; &lt;Setter Property="Background" Value="Blue"/&gt; &lt;/Style&gt; &lt;/UserControl.Resources&gt; </code></pre> <p>However I dont believe you want to set the style of the adornedelement within the placeholder. It's just a placeholder for any control with that template. You should set the style of the adornedelement in the element itself like the example I provided above. If you want to style the control based upon it's validation then something like this:</p> <pre><code>&lt;Window.Resources&gt; &lt;ControlTemplate x:Key="validationTemplate"&gt; &lt;DockPanel&gt; &lt;TextBlock Foreground="Yellow" Width="55" FontSize="18"&gt;!&lt;/TextBlock&gt; &lt;AdornedElementPlaceholder/&gt; &lt;/DockPanel&gt; &lt;/ControlTemplate&gt; &lt;Style x:Key="textBoxInError" TargetType="{x:Type TextBox}"&gt; &lt;Style.Triggers&gt; &lt;Trigger Property="Validation.HasError" Value="true"&gt; &lt;Setter Property="Background" Value="Red"/&gt; &lt;Setter Property="Foreground" Value="White"/&gt; &lt;/Trigger&gt; &lt;/Style.Triggers&gt; &lt;/Style&gt; &lt;/Window.Resources&gt; &lt;StackPanel x:Name="mainPanel"&gt; &lt;TextBlock&gt;Age:&lt;/TextBlock&gt; &lt;TextBox x:Name="txtAge" Validation.ErrorTemplate="{DynamicResource validationTemplate}" Style="{StaticResource textBoxInError}"&gt; &lt;Binding Path="Age" UpdateSourceTrigger="PropertyChanged" &gt; &lt;Binding.ValidationRules&gt; &lt;ExceptionValidationRule/&gt; &lt;/Binding.ValidationRules&gt; &lt;/Binding&gt; &lt;/TextBox&gt; &lt;/StackPanel&gt; </code></pre>
 

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