Get location of all current touches on Windows Phone screen

How do I get the location of all current touches on the phone's screen in a mobile Silverlight a开发者_C百科pplication? The technique described at http://msdn.microsoft.com/en-us/library/ff434208.aspx seems to only apply to XNA applications. Otherwise, it gives the error "The name 'touchPanel' does not exist in the current context".

---

This article should help you determine all the touchpoints in a Silverlight WP7 Application.

The idea behind is to use TouchPointCollection in Codebehind.