This is one of the items that is tested in your Windows 8 App when you use the WACK.

If you are in Southern California, please email this post for more information on getting a token for your app by June 30, 2012!

 

Toast Notifications

Toast notifications should be used for relevant and time sensitive information only.
They should be actionable (user clicking on them should navigate to an actionable place within your app).
Toast notifications should be concise and clear; don’t use content that is not required; do not add chrome.
Ensure you follow the other dos and don’ts from the guidelines for toast notifications.

Reference (HTML)

http://msdn.microsoft.com/en-us/library/windows/apps/hh465391

Reference (XAML)

http://msdn.microsoft.com/en-us/library/windows/apps/hh465391