OK, got it.

How did you solve this issue, I'm trying to find where I can download the Telerik.Windows.Diagrams.Features assembly used in the demos.

Hello Mattias ,

 You can find the "Features" SL project in the "Features" folder located in the installation folder of RadControls. The path should be;
C:\Program Files (x86)\Telerik\RadControls for Silverlight Q1 2012\Demos\Examples\Features
You have to build this project and use it as assembly. Please let us know if you need further assistance.

Greetings,
Petar Mladenov
the Telerik team

Hi,

Is there a similar sample code written in vb.net, if so can somebody direct me where I can get those?
 
or if possible can somebody direct me on how to do a simple diagram with 2 rectangles and a connection, that would be very great for the start up for me,
 
Thanks.

Got that, exactly what I was looking for,
 
http://www.telerik.com/help/silverlight/raddiagram-getting-started.html