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    copied!<p>You can't directly use the Visibility property for a fade out because setting a trigger on it will first Hide/Collapse the control, THEN animate it. So basically you'll got an animation on a collapsed control => nothing.</p> <p>One "reliable" way would be to introduce a new Dependency Property (attached or not), say <code>IsOpen</code> and setting a property trigger <code>IsOpen=True</code> on it with:</p> EnterAction: <ul> <li>Make sure Visibility is set to Visible</li> <li>Fade in the Opacity from 0 to 1</li> </ul> ExitAction: <ul> <li>Visibility set to Visible at keyframe 0 and Collapsed/Hidden at the last Keyframe</li> <li>Fade out the Opacity from 1 to 0.</li> </ul> <p>Here's an example:</p> <pre><code>&lt;Style TargetType="{x:Type local:TCMenu}"&gt; &lt;Style.Resources&gt; &lt;Storyboard x:Key="FadeInMenu"&gt; &lt;DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Opacity)" Storyboard.TargetName="{x:Null}"&gt; &lt;EasingDoubleKeyFrame KeyTime="0" Value="0"/&gt; &lt;EasingDoubleKeyFrame KeyTime="0:0:0.2" Value="1"/&gt; &lt;/DoubleAnimationUsingKeyFrames&gt; &lt;ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Visibility)" Storyboard.TargetName="{x:Null}"&gt; &lt;DiscreteObjectKeyFrame KeyTime="0:0:0.0" Value="{x:Static Visibility.Visible}"/&gt; &lt;/ObjectAnimationUsingKeyFrames&gt; &lt;/Storyboard&gt; &lt;Storyboard x:Key="FadeOutMenu"&gt; &lt;DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Opacity)" Storyboard.TargetName="{x:Null}"&gt; &lt;EasingDoubleKeyFrame KeyTime="0" Value="1"/&gt; &lt;EasingDoubleKeyFrame KeyTime="0:0:0.2" Value="0"/&gt; &lt;/DoubleAnimationUsingKeyFrames&gt; &lt;ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Visibility)" Storyboard.TargetName="{x:Null}"&gt; &lt;DiscreteObjectKeyFrame KeyTime="0:0:0.0" Value="{x:Static Visibility.Visible}"/&gt; &lt;DiscreteObjectKeyFrame KeyTime="0:0:0.2" Value="{x:Static Visibility.Collapsed}"/&gt; &lt;/ObjectAnimationUsingKeyFrames&gt; &lt;/Storyboard&gt; &lt;/Style.Resources&gt; &lt;Style.Triggers&gt; &lt;Trigger Property="IsOpen" Value="true"&gt; &lt;Trigger.EnterActions&gt; &lt;BeginStoryboard Storyboard="{StaticResource FadeInMenu}"/&gt; &lt;/Trigger.EnterActions&gt; &lt;Trigger.ExitActions&gt; &lt;BeginStoryboard Storyboard="{StaticResource FadeOutMenu}"/&gt; &lt;/Trigger.ExitActions&gt; &lt;/Trigger&gt; &lt;/Style.Triggers&gt; &lt;Setter Property="Visibility" Value="Collapsed" /&gt; &lt;/Style&gt; </code></pre>
 

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