Play A look into the ComponentOne Studio for Silverlight
During MIX09 I had the opportunity to sit down with the guys from ComponentOne and take a look at the controls available in their new Studio for Silverlight 2009 release. Along with a full-featured datagrid and richtextbox, they demoed a BitMap API and Effects running in Silverlight 2, which we had just announced for Silverlight 3. The other feature that really stood out for me was the fact that they were supporting the same themes as the Silverlight Toolkit. Even if you're using controls from different assemblies, you still want them to look cohesive and this is what theme support can provide.