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    <p>Dr TJ's answer is right enough. Going down that route you'd have to wrap <code>ObservableCollection&lt;T&gt;</code> and implement a BeforeDelete event,..then you could use an <code>EventTrigger</code> to control the storyboards.</p> <p>That's a right pain though. You're probably better creating a <code>DataTemplate</code> and handling the <code>FrameworkElement.Loaded</code> and <code>FrameworkElement.Unloaded</code> events in an <code>EventTrigger</code>. </p> <p>I've put a quick sample together for you below. You'd have to sort out the remove code yourself but I'm sure you're up to it.</p> <pre><code> &lt;ListBox&gt; &lt;ListBox.ItemsSource&gt; &lt;x:Array Type="sys:String"&gt; &lt;sys:String&gt;One&lt;/sys:String&gt; &lt;sys:String&gt;Two&lt;/sys:String&gt; &lt;sys:String&gt;Three&lt;/sys:String&gt; &lt;sys:String&gt;Four&lt;/sys:String&gt; &lt;sys:String&gt;Five&lt;/sys:String&gt; &lt;/x:Array&gt; &lt;/ListBox.ItemsSource&gt; &lt;ListBox.ItemTemplate&gt; &lt;DataTemplate&gt; &lt;TextBlock Text="{Binding}" Opacity="0"&gt; &lt;TextBlock.Triggers&gt; &lt;EventTrigger RoutedEvent="FrameworkElement.Loaded"&gt; &lt;BeginStoryboard&gt; &lt;Storyboard&gt; &lt;DoubleAnimation Storyboard.TargetProperty="Opacity" Duration="00:00:02" From="0" To="1" /&gt; &lt;/Storyboard&gt; &lt;/BeginStoryboard&gt; &lt;/EventTrigger&gt; &lt;EventTrigger RoutedEvent="FrameworkElement.Unloaded"&gt; &lt;BeginStoryboard&gt; &lt;Storyboard&gt; &lt;DoubleAnimation Storyboard.TargetProperty="Opacity" Duration="00:00:02" From="1" To="0" /&gt; &lt;/Storyboard&gt; &lt;/BeginStoryboard&gt; &lt;/EventTrigger&gt; &lt;/TextBlock.Triggers&gt; &lt;/TextBlock&gt; &lt;/DataTemplate&gt; &lt;/ListBox.ItemTemplate&gt; &lt;/ListBox&gt; </code></pre> <p>HTH, Stimul8d</p>
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    1. POHow can I implement fading in and out of Added/Removed ListItems
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    1. COI was looking for a solution like this for the LongListSelector on Windows Phone, but alas I found this comment on the MSDN documentation page for the FrameworkElement.Triggers property "EventTrigger can only support a triggering action for the Loaded event (you name the triggering event in the EventTrigger.RoutedEvent property.)" Reference: http://msdn.microsoft.com/en-us/library/system.windows.frameworkelement.triggers(v=vs.95).aspx
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