// weng modified on 20170531 1016        private Point lastMovedPoint;        private Point HandleCursorValues( Point mousePt )        {            GraphPane pane = _masterPane.FindPane( mousePt );            if (pane != null && pane.Chart._rect.Contains(mousePt) && !mousePt.Equals(lastMovedPoint))            {                double x, x2, y, y2;                bool isShowYAxis2Value;                pane.ReverseTransform( mousePt, out x, out x2, out y, out y2 );                string xStr = MakeValueLabel( pane.XAxis, x, -1, true );                string yStr = MakeValueLabel( pane.YAxis, y, -1, true );                string y2Str = MakeValueLabel( pane.Y2Axis, y2, -1, true );                isShowYAxis2Value = GraphPane.Y2Axis.IsVisible;                this.pointToolTip.AutomaticDelay = 500;                this.pointToolTip.SetToolTip( this, "( " + xStr + ", " + yStr + (isShowYAxis2Value?(", " + y2Str):"") + " )" );                this.pointToolTip.Active = true;                lastMovedPoint = mousePt;            }            else if (pane == null || !pane.Chart._rect.Contains(mousePt))                this.pointToolTip.Active = false;            return mousePt;        }