Presently, you can determine the actions of the end user on the zooming and scrolling of the control, by keeping track of the rangeStart/end properties:
void radChart_DataBound(object sender, ChartDataBoundEventArgs e)
double minRange = radChart.DefaultView.ChartArea.ZoomScrollSettingsX.RangeStart;
You can match this against the data of the axis, to determine what data would be rendered in the chart.
I hope this information gets you started. Let me know if further questions arise.
the Telerik team
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