The RadChartView and RadTimeLine are controls that are different in nature and implementation. The chart view uses a pan and zoom feature (which allows this behavior that you describe) whilst the time line needs to be told exact values (VisiblePeriodStart and VisiblePeriodEnd).
In short - this can not be achieved with out-of-the-box means. However I think that you might be able to get these results manually. I am not familiar with your scenario but may be you can manually calculate (when a new item is inserted) the new values for VisiblePeriodStart and VisiblePeriodEnd.
I have attached a simple project that should get you started.
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