Silverlight swing effect in web template?

Can anyone tell how this check this link here (swing) effect is given in this web template of Silverlight? Is there any 开发者_如何学Pythonopen source project or template like this?

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Download the Sample and take a look at the source code.

Its already covered with a Creative Commons license, take a look for any additional licence or readme just in case the author has included an attribution requirement.