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How to begin storyboard based on ListBoxItem selection???

Posted By:      Posted Date: September 30, 2010    Points: 0   Category :WPF
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I encounter a problem that I cannot solve. I hope to find an answer here. I need a listbox to hide half way when a certain listboxitem is selected. I setup a storyboard with opacity mask animation which work fine in blend. My problem I cannot initiate BeginStoryboard. I tried numerous ways and no success. I need to hide the listbox to reveal the content behind it. I generate listboxitems from XML data file and based on the name node I planned to initiate storyboard playing.

Here what I have. I created DataTemplate which I set via Setter in ListBoxItem Style:

<DataTemplate x:Key="SelectedListBoxItemDataTemplate">
			<StackPanel x:Name 

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