As far as I understand the scenario you want to achieve is the following one:
I belive that the faster way to implement it is to use the provided online demo as a start point and to us ethe same approach if possible. If this apoproach does not work for you, provide more details why and we will think of another reasonable solution for the problem.
On a side note, when you install RadControls, our online examples projects are automatically installed on your computer and you can not only examine their full source code, but also extend them further in order to meet your requirements.
You can open the demos from here:
Start\Programs\Telerik\RadControls for ASPNET AJAX\Open Sample WebSite In VisualStudio
The actual location on your hard disk is the following one:
C:\Program Files\Telerik\RadControls for ASPNET AJAX \Live Demos
I hope that this information is helpful.
the Telerik team