Questions

Hello Robin,

yesterday I had to change that behavior in my application. Best way I found was to take out ZoomExtentsModifier and create a simple method that sets the visible range to minimum and maximum of that axis.
You will have to adapt a bit to your solution specially the GetCompleteRange (I have more then 1 yaxis)

hope it helps

<SciChart:SciChartSurface x:Name="chart"
                                  MouseDoubleClick="ModifierGroup_MouseDoubleClick"
                                  >

        private void ModifierGroup_MouseDoubleClick(object sender, MouseButtonEventArgs e)
        {
            ZoomExtents();
        }
        public void ZoomExtents()
        {
            SetDistanceXAxisVisibleFullRange();
            SetSpeedYAxisVisibleRange();            
        }
        public void SetSpeedYAxisVisibleRange()
        {
            SpeedVsDistanceAxis.AutoRange = false;
            SpeedVsDistanceAxis.VisibleRange = new DoubleRange(0, Properties.Settings.Default.VMax);
        }
        /// <summary>
        /// sets the visible range of the X axis to the full range
        /// </summary>
        public void SetDistanceXAxisVisibleFullRange()
        {
            double xmin, xmax, ymin, ymax;
            GetCompleteRange(out xmin, out xmax, out ymin, out ymax);

            ((NumericAxis) chartDistanceSpeed.XAxis).VisibleRange = new DoubleRange(xmin, xmax);

        }
        public void GetCompleteRange(out double xmin, out double xmax, out double ymin, out double ymax)
        {
            DoubleRange range = ((NumericAxis)chartDistanceSpeed.XAxis).GetMaximumRange().AsDoubleRange();
            xmin = range.Min;
            xmax = range.Max;

            if (chartDistanceSpeed.YAxis == null)
                range = ((NumericAxis)chartDistanceSpeed.YAxes.GetAxisById("DefaultAxisId")).GetMaximumRange().AsDoubleRange();
            else 
                range = ((NumericAxis) chartDistanceSpeed.YAxis).GetMaximumRange().AsDoubleRange();
            ymin = range.Min;
            ymax = range.Max;
        }