Beat Kiener implemented a VisifireWrapper control which makes the Charts bindable to a ViewModel.
The Visifire chart control is very cool and handy, but there is one missing part: it does not support data binding. The Visifire team confirmed that the current release (version 3.0.1.0) is not bindable and they are working on this issue with high priority. In the meantime, the VisifireWrapper is a very helpful base class to implement custom Visifire charts which are bindable to a ViewModel without having a strong reference between the View and ViewModel. The control supports the Silverlight content model except data-templating and encapsulates the weak-event-pattern.