Hello Dhaval Shah,
Thank you for your interest in our products.
The RadControls for ASP.NET AJAX are all part of the same framework and are shipped in a single assembly. This significantly facilitates the deployment and upgrade of the controls. Additionally to allow better functionality as some controls are incorporated in others, which is made possible by the common framework the controls share.
For example RadEditor uses RadWindow to display dialog boxes and RadUpload for file upload. However, all these benefits come at a cost - the controls can be offered only as a suite and individual controls, are not offered as standalone products.
This means that in order to receive the RadTreeView control, you’ll need a license for the whole RadControls for ASP.NET AJAX suite.
If you have any additional questions, please let me know.
the Telerik team