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For those who have worked with Silverlight 1.0, one of the first observations you most likely made was the lack of common controls such as the Button, TextBox, and ListBox. In fact, Silverlight 1.0 provided only two basic controls: Rectangle and TextBlock. From these, developers were expected to implement all of the rich controls they needed. As you can imagine, it was quite a bit of work to create all of the form controls using just these two base controls.
Since then, Microsoft’s vision of Silverlight has gone beyond basic animations to spark up your applications and into the realm of feature-rich user interfaces (UIs). To this end, Silverlight includes a strong base of controls you can use within your Silverlight applications.