I suggest creating custom containers that include the necessary information ( start, end dates ) in a TextBlock( for example ) and add these containers before and after each GanttTask EventContainer.
help article you can find code snippets and information on how to create and include custom containers in the Timeruler part of the RadGanttView
. Also we have an example that demonstrates this approach - "GanttView Deadline"
. The examples are available for download from this link - http://demos.telerik.com/wpf/
Hopefully this helps.
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.