How to change the Secondary y-axis characters of a chart in Excel?

I add a chart in Excel with matlab commands, which includes several lines and both Primary y-axis and Secondary y-axis are used. I can change the x-axis & Primary y-axis characters using Chart.Axes(1) & Chart.Axes(2), but I didn't find a way to change the characters of the Secondary y-axis. I have tried to use Chart.Axes(3) as the handle of the Secondary y-axis but failed. My question is: How could I change the Secondary y-axis characters of a chart in Excel by matlab commands? Thank you very much

[Walter Roberson]

Duplicates http://uk.mathworks.com/matlabcentral/answers/229872-how-to-control-secondary-y-axes-characters-of-xls-chart-by-matlab-commands