How to animate visibility of a StackPanel in Silverlight to expand and collapse?

In my case, I would like the expand/collapse to happen from left to right and开发者_高级运维 right to left respectively.

The animation should happen when the visibility changes.

Thank you.

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You could create two animation storyboards (One for expanding and one for Collapsing) that animates the Width of the stackpanel, then on StackPanel_VisibilityChanged run the appropriate animation.

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I recommend animating on the Width property rather than ScaleX. Otherwise the entire control (StackPanel) will look crunched/stretched as its animating.