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In order to achieve the desired quarterly intervals in the RadGanttView control you will need to create a custom GroupTickLine
by creating a class that inherits TickIntervalBase
and overriding its methods.
You can take a look at our online example
which shows how to achieve the desired intervals. The same example is also available in our WPF demos here
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.