Scaling Multiple Axis

To scale both independent axes you should link the scale and value properties of both axes using the PropertyChanged event like the following:

// suppose ay2 is auxiliary y-axis

 ((INotifyPropertyChanged)chart.View.AxisY).PropertyChanged += (s, e) =>
   {
     if (e.PropertyName == "Scale")
     {
       ay2.Scale = chart.View.AxisY.Scale;
     }
     else if (e.PropertyName == "Value")
     {
       ay2.Value = chart.View.AxisY.Value;
     }
   };

See Also

Scaling Multiple Axis