MessageDialog md = new MessageDialog("消息内容", "标题");
md.Commands.Add(new UICommand("确定", cmd =>
{
//处理程序
}));
md.Commands.Add(new UICommand("放弃", cmd =>
await md.ShowAsync();
win8开发入门--对话框
原文：http://www.cnblogs.com/lzn1007/p/4186183.html
