At present, the latest version of the control has an extended selection api, which can be used, once the end user selects a series item.
The other functionality, which you mentioned (getting the values while you mouse over the chart area) is not supported at present out of the box. One possible option in this case would be to track the mouse movements over the chart area, and match this data to the relevant actual data. However, this would require custom logic and code, depending on the data, data series and chart layout.
I hope this information helps.
the Telerik team
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