Please note that this has been fixed long time ago and the correct Foreground can be observed in our latest official release version from this online demo
(make sure you choose Expression_Dark RadioButton).
We highly recommend our clients to always download and use the latest version of our controls. The reason behind this is they get all latest bug fixes, new features and full support for our controls.
On a side note - you might still achieve the same look with your current binaries version with the Timeline control if you use our implicit styles mechanism and NoXAML binaries. Then just change the Foreground of the groups like this:
If you are not familiar with our implicit styles you can get to know them from our documentation (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.