according to this article http://electricbeach.org/?p=653 and many others it's trivial to make a layout path.
Well I've downloaded phone 7 developer kit but when I try to convert a shape (es. circle) to layout path is impossible because command is not active. Also pathlistbox don't exist in my blend version... you know why?
You can only use the PathListBox in Silverlight 4 onwards, which is available on the Mango build of Windows Phone 7. You will need to download and install the Developer Tools for Windows Phone Mango.