silverlight依赖属性

依赖属性（Dependency Property）和附加属性（Attached Property）

参考

http://www.cnblogs.com/KevinYang/archive/2010/03/28/1699083.html

http://www.cnblogs.com/pszw/archive/2012/01/06/2312269.html

http://www.cnblogs.com/liping13599168/archive/2010/05/07/1729357.html