Windows Phone 7 swimming tiles effect

I wonder how to achieve effect of swiming tiles (like in windows phone 7, when you start arrange start menu tiles - other ones swim开发者_Go百科 softly and randomly). Someone have any ideas?

Check out the HubTile implementation in the Windows Phone toolkit, full open source is up at http://silverlight.codeplex.com/ - it has a hub tile service that manages such communication.