[VB]	Public Event ViewPortChanged As System.EventHandler
[C#]	public event System.EventHandler ViewPortChanged;

This event occurs when the view port is changed by mouse actions in the browser side Javascript ChartViewer (JsChartViewer).

To fire this event, the JsChartViewer should be used on the browser side, and it should not be configured to use partial chart updates (AJAX updates). If partial chart updates are used, instead of firing the ViewPortChanged event, AJAX based requests will be sent to the server side instead.