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copied!<p><strong>EDIT:</strong> I have overseen the fact that the <code>TextBlock</code> is in the <code>ControlTemplate</code> of your custom Window/Control. I do not think that it is possible to target a control <em>within</em> the <code>ControlTemplate</code> from a <code>Storyboard</code> <em>outside</em> of this <code>ControlTemplate</code>. You could however define a property on your custom Window which you then databind to your <code>ChangeOccurred</code> property, and then add the trigger to your <code>ControlTemplate</code> which will now get triggered by the custom Control's property rather than the Window's ViewModel's property (of course, indirectly it is triggered by the ViewModel because <code>ChangeOccurred</code> is bound to the property of the custom Window which in turn triggers the animation - uh, complex sentence, hope you understand). Is this an option? Could you follow? ;-)</p> <p>Maybe some code helps:</p> <pre><code>public class MyCustomWindow : Window { public static readonly DependencyProperty ChangeOccurred2 = DependencyProperty.Register(...); public bool ChangeOccurred2 { ... } // ... } </code></pre> <p>And some XAML:</p> <pre><code><local:MyCustomWindow ChangeOccurred2="{Binding ChangeOccurred}" ... >  </local:MyCustomWindow>  <ControlTemplate TargetType="{x:Type local:MyCustomWindow}">  <ControlTemplate.Triggers> <Trigger Property="ChangeOccurred2" Value="True"> <Trigger.EnterActions> <BeginStoryboard> <Storyboard BeginTime="00:00:00" Duration="0:0:2" Storyboard.TargetName="txtWhatever" Storyboard.TargetProperty="(Background).(SolidColorBrush.Color)"> <ColorAnimation FillBehavior="Stop" From="Black" To="Red" Duration="0:0:0.5" AutoReverse="True"/> </Storyboard> </BeginStoryboard> </Trigger.EnterActions> </Trigger> </ControlTemplate.Triggers> </ControlTemplate> </code></pre> <p><strong>Note:</strong> I named the Window's property <code>ChangeOccurred2</code> because I wanted it to be distinguishable from the ViewModel's <code>ChangeOccurred</code> property. Of course, you should choose a better name for this property. However, I am missing the background for such a decision.</p> <hr> <p><strong>My old answer:</strong></p> <p>So, you want to animate a <code>TextBlock</code> which is in the content of a (custom) Window?!</p> <p>Why do you want to set the style on the Window, and not on the <code>TextBlock</code> itself? Maybe you should try something like this (did not test this!):</p> <pre><code><local:MyCustomWindow ... >  <TextBlock x:Name="textBlockAnimated" ... > <TextBlock.Style> <Style TargetType="{x:Type TextBlock}"> <Style.Triggers> <DataTrigger Binding="{Binding ChangeOccurred}" Value="True"> <DataTrigger.EnterActions> <BeginStoryboard> <Storyboard BeginTime="00:00:00" Duration="0:0:2" Storyboard.TargetProperty="(Background).(SolidColorBrush.Color)"> <ColorAnimation FillBehavior="Stop" From="Black" To="Red" Duration="0:0:0.5" AutoReverse="True"/> </Storyboard> </BeginStoryboard> </DataTrigger.EnterActions> </DataTrigger> </Style.Triggers> </Style> </TextBlock.Style> </TextBlock>  </local:MyCustomWindow> </code></pre> <p>The <code>{Binding ChangeOccurred}</code> might not be sufficient. You might have to add a <code>DataContext</code> to the <code>TextBlock</code>, or add a <code>RelativeSource</code> or something.</p>

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