Hello peter shitote,
Thank you for using our services.
We distribute the Telerik.Web.UI and Telerik.Web.Design assemblies together with Sitefinity website. The Telerik.Web.UI.dll contains the RadControls for ASP.NET Ajax so you can add them either to your Sitefinity website toolbox, or your visual studio toolbox.
You can add each control of the controls suite by referencing it in the <toolbox> configuration section of your website's web.config:
"RadControls for ASP.Net AJAX"
In VS you can go to your toolbox, right click it and select add another tab. Then in the tab right click and select choose items. Then you will see a window pop up. In the .NET Framework Components tab click browse and navigate to the bin folder of your website and choose the Telerik.Web.UI dll. This will add the RadControls for ASP.NET Ajax suite to your VS toolbox.
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