Most versions of snoop that I keep coming across have a problem updating the UI dynamically at runtime via the SNOOP property grid editor. Felix Corke recently pointed me in the direction of a fixed version…
http://snoopwpf.codeplex.com/
The most recent version 2.6.0, now just works out of the box. No longer do you have 4 versions for the different flavours of 32bit/64bit and .net 4.0 and .net 3.5, it just figures it all out for you since version 2.6.0 was released.
The best news of all though, is that it now also works with wpf controls that are hosted inside a windows forms host control.
Recommend installing that latest version if you’re currently doing wpf development.