msdn:
http://msdn.microsoft.com/en-us/library/ms742868.aspx
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The TargeName may only refer to child objects of the ControlTemplate. If TargeName is not specified, the animation targets the element to which the ControlTemplate is applied.
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The SourceName for an EventTrigger or a Trigger may only refer to child objects of the ControlTemplate.
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You can't use dynamic resource references or data binding expressions to set Storyboard or animation property values. That's because everything inside a ControlTemplatemust be thread-safe, and the timing system must Freeze Storyboard objects to make them thread-safe. A Storyboard cannot be frozen if it or its child timelines contain dynamic resource references or data binding expressions.
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In XAML, you can't declare event handlers for Storyboard or animation events.