Zoom. Caliburn: An Application Framework for WPF and Silverlight - Hom. Silverlight Spy : First Floor. Note: the Silverlight Spy setup package is digitally signed with a code signing certificate where the publisher is identified as First Floor Software. Please verify the publisher to ensure you have downloaded genuine software. If you have purchased a license of Silverlight Spy 4, you can download and install this copy. Start Silverlight Spy, enter the license key and Silverlight Spy will work as a full version. Mike Taulty: 44 Amazing Silverlight 2.0 Screencasts.