RadChart Zooming and Scrolling works using data virtualization. This means that by dragging the slider you change the data the chart currently is bound to. Unfortunately currently RadChart doesn't support smooth scrolling. We are working on a new charting solution for Q3 that will have better support for zooming and scrolling. You can take a look at our beta demos here. This feature wasn't included in the beta, but it will be released with the final release which is due in 2 weeks.
All the best,
the Telerik team
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