As most developers, my first test with a new technology begins with the good old “Hello World” sample and the same happened when I started digging into Metro/WinRT SDK, and you can imagine my face when I discovered that MessageBox class is no longer there. After a few second of panic :-) I placed a search on SDK and (relief) found that its indeed alive and kicking (even in a different form) inside Windows.UI.Popups namespace with a brand new name: MessageDialog So I started writing my first WinRT MessageDialog using this code: ...