progressbar样式

http://www.oschina.net/question/8676_11797

http://blog.****.net/ouyangtianhan/article/details/6565768

http://my.oschina.net/amigos/blog/59871

http://blog.****.net/mars2639/article/details/6620836

http://www.cnblogs.com/angeldevil/archive/2011/12/02/2271096.html