Animation for removed listview item

Hi guys

Does anyone has any samples or suggestion how to play storyboard when a item remove from listview?

i create two Triggers and storyboard , one for when item loaded and one for item unloaded. when i add new item to listview i can see animation , but when i remove a item from listview i cant see any animation. why?? 

(I do not know very well English)

sofalzadeh

<Window.Resources><Style TargetType="{x:Type ListViewItem}"><Style.Triggers><EventTrigger RoutedEvent="Loaded"><EventTrigger.Actions><BeginStoryboard><Storyboard><DoubleAnimation Storyboard.TargetProperty="Opacity" From="0" To="1" Duration="0:0:2"></DoubleAnimation></Storyboard></BeginStoryboard></EventTrigger.Actions></EventTrigger><EventTrigger RoutedEvent="Unloaded"><EventTrigger.Actions><BeginStoryboard><Storyboard><DoubleAnimation Storyboard.TargetProperty="Opacity" From="1" To="0" Duration="0:0:2"></DoubleAnimation></Storyboard></BeginStoryboard></EventTrigger.Actions></EventTrigger></Style.Triggers></Style></Window.Resources>