In this post
Colin Eberhardt describes an update to the Silverlight MultiBinding solution he presented last year. This update includes support for Silverlight 4, attached properties and multiple bindings on a single object.
MultiBinding is a WPF feature that allows you to bind a single property to a number of sources, with the source values being combined by a value converter. This is a feature that is missing from Silverlight. About a year ago I developed a MultiBinding solution for Silverlight, which has proven very popular! I even had an email from an Microsoft Attorney asking if they could use it in the Silverlight Facebook client (How cool is that 
). I was also very happy when Stefan Olson made a few updates to this code to allow multiple MultiBindings on a single object and spotted the SL4 issue. This blog post is a quick demonstration of these new features …