Hello Mike,
Thanks for contacting us.
Since Q3 2010 the easiest way to change the version of the Telerik controls in the toolbox is using the Toolbox Configurator. It can be launched from the Telerik menu, RadControls for WinForms -> Launch Toolbox Configurator.
If the version of your Visual Studio Extensions is older than Q3 2010, please refer to the following article -
Adding RadControls to Visual Studio Toolbox.
I hope this will help.
Best regards,
Chavdar
the Telerik team
Register for the Q2 2011 What's New Webinar Week. Mark your calendar for the week starting July 18th and book your seat for a walk through of all the exciting stuff we will ship with the new release!