wpf how to tell if a storyboard is reversed?

I know i can hook into the State Changed event and others, however what i can not figure out is how to tell if my storyboard is running in reverse. It is set to auto reverse and repeat forever, and that works well. Now I jut need 开发者_如何学JAVAa little help on how to tell which way it is playing. Many thanks.

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There is not an easy way to determine that from the Storyboard alone - I would set an either/or value like Visibility on an extra element to determine that:

• Visibility.Visible when forward
• Visibility.Collapsed when backwards