Thank you for the question.
Please refer to this article
which regards the topic of loading a built-in theme. Further, the process of saving a theme in VSB and loading the saved package in your project is described here
I hope this helps.
the Telerik team
Q3’10 SP1 of RadControls for WinForms is available for download
; also available is the Q1'11 Roadmap
for Telerik Windows Forms controls.