There have been fixes and improvements of the RadDock functionality since the 2011.1.315.35 version of RadControls for ASP.NET AJAX, e.g. the Dock / Keyboard Support
. Nevertheless the main features of the control are available in this release, so you should not have problems with using the functionalities, shown in the demos.
You can check the Release History
of RadControls for a detailed list of the changes that were made to the dock since the 2011.1.315.35 version.
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