It appears you are looking to use the Bar 3D type of RadChart. You can find a list of the 3D chart types here.You declare the type of chart when you implement it in your XAML, you can also use Visual Studio's IntelliSense to see the types available to you when you first type the namespace.
If you want to further customize the style than what you get "out of the box", you can learn about Style and Templates here.