Communication between Silvelight controls with no explicit Javascript, just the HTML bridge. Drag the circle in the first Silverlight control and watch the circle in the second control move. I found this technique from Jeff Prosise's Blog. Check out the rest of his Cool Silverlight Tricks. Note: I have only implemented the drag for the first silverlight control but extending it to work on the second would be easy. If you would like to learn more or would like the complete source code then visit my blog.