“Applications compiled on Silverlight 4 beta willn’t work with Silverlight RC. This’s known/expected,” Tim Heuer revealed. Users who’ve installed Silverlight Client for Facebook for Silverlight 4 Beta will need to first remove older version and then deploy the latest iteration. Otherwise, those interested in testing Silverlight Client for Facebook only need to deploy Silverlight 4 RC runtime. Silverlight Client for Facebook for Silverlight 4 RC brings a number of changes: “Custom Window options are clearly visible. You’ll notice the ‘window chrome’ (as it's referred to) is gone and custom window is in the app,” Heuer said. There’re also changes to graphical user interface. Microsoft has worked to deliver custom maximize, minimize and close buttons, and to redesign the lower-right corner to resize graphics details. “The updated application also implements the ‘mini-mode’ (from toolbar area in upper right) which produces a stripped down view of the main news feed,” Heuer revealed.
Download: Silverlight for Facebook application