Snoop is the open source WPF spying utility created by Pete Blois when he was employed at Microsoft and now maintained by myself Cory Plotts. Over time contributions have been added by several people, most notably: Dan Hanan, Andrei Kashcha, Maciek Rakowski, Bailey Ling, and Bastian Schmidt. It allows you to spy/browse the visual t ree of a running application (without the need for a debugger) ... and change properties ... amongst other things. ree of a running application (without the need for a debugger) ... and change properties ... amongst other things.