Compared to our latest official release version of RadTimeBar, I should say that the RadTimeBar Style has several changes that are not shown in this help topic. Our technical writers are notified about that and the topic will be updated.
What I suggest is that you use our implicit styles mechanism to modify the default radtimebar style per your requirements. The implicit styles mechanism has several advantages as described in further details here.
I would also suggest that you follow the steps of this help topic that uses the implicit styles mechanism with RadTimeBar.
All the best,
the Telerik team