In this episode, I am joined by Koen Zwikstra, the author of XAML Spy, a visual runtime inspector for Silverlight, Windows Phone, Windows Store and WPF apps. Koen shows how to use XAML Spy to view an app's visual tree, examine and modify properties of any element, browse files in isolated storage and more. This is a very cool tool for getting a better understanding of what is happening in your XAML apps.