The result you describe is expected, because when you move the mouse above the content of the timeBar, you are actually moving the mouse over the item intervals. You can check this in our First look online demo - http://demos.telerik.com/silverlight/#TimeBar/FirstLook. Moving the mouse over the content area, marks one item interval as hovered, thus indicating the selection, in case the user clicks this item interval.
You can re-template the timeBar, in order to change this behavior. However, you might run into problems as the timeBar was not intended to work this way,
All the best,
the Telerik team
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