You can check our PersistenceFramework
control on how to how to save the properties of your UI elements.
As to saving RadGridView's settings, you may check the "GridView Serialization" WPF Demo. You can also find the "GridView serialization" github example on how to persist control's settings.
Although GitHub is a very well-known platform we saw a better and easier approach for reviewing our examples developing our brand new SDK Samples Browser. You can install it and then use it to review the examples.
Check out Telerik Analytics, the service which allows developers to discover app usage patterns, analyze user data, log exceptions, solve problems and profile application performance at run time. Watch the videos
and start improving your app based on facts, not hunches.