If you are coding in .NET, and a basic knowledge in XML, you will be familiar on how XAML is used. XML is a language for .NET 3.0 which is responsible for creating forms and elements. It is also a markup language similar to HTML. Unfortunately, there is no GUI tool for now that helps in coding with XML, so you’ll have to do each code manually.
For starters, create a simple button using XAML. You can do that by using this code: <Button />. It is also possible to add height and width attribute to the button like this: <Button height=”100″ width=”80″ />
Read the rest of the tutorial here: http://dotnetslackers.com/articles/silverlight/IntroductiontoXAMLPart1.aspx