参照连接:http://www.cnblogs.com/salam/archive/2010/11/15/1877512.html
http://blog.csdn.net/happyq/article/details/6417528
圆角对话框:http://wang-peng1.iteye.com/blog/559372
点击“确定”或“取消”按钮,对话框不消失:http://blog.csdn.net/abby_dcy/article/details/6049535