This event is reported as you drag a data point from a dragable series. The message reports the (chart, series, row, column, new-x, new-y) as a 6-element vector. To get this stream of events, set the ‘Tracking’ property to ‘true’, otherwise you only get the CDSTART and CDEND events on mouse-down and mouse-up. You may reject the event, or modify the message by changing elements of ¾, for example to provide a ‘stepping’ behaviour by rounding to some appropriate batch size.