In our latest release Q3 2011 we introduced Metro skin which is Win8 based. Note, that in shortly five more Metro skins will be available for download from our Skin Sharing Portal
- Metro Magenta, Metro Lime, Metro Green, Metro Red, Metro Orange. All of them are Win8 based and will give you the opportunity to develop Win8 look and feel applications.
You could also check RadButton Add Elements in RadButton demo
which shows how you could customize Telerik controls to look pretty much the same to the image you attached.
the Telerik team
If you want to get updates on new releases, tips and tricks and sneak peeks at our product labs directly from the developers working on the RadControls for ASP.NET AJAX, subscribe to their blog feed