Hi Dalvir,
We regret for the delayed response. Please find response to your queries below.
1) If your intention is to display Tooltip with Y Axis value, ChartControl will by default display the Value corresponding to the Secondary Y axis, When a series is assigned to the Secondary Y axis.
I have attached sample that illustrates the same in this link below.
http://websamples.syncfusion.com/samples/Chart.Windows/F75763/Sample1.htm2) If your intention is to get the Secondary Y axis value at the MousePoint for manipulation, We regret to inform you that currently we do not have support for getting the Y Axis values. And we have created a feature request in this regard and have forwarded it to our Developers. I will get back to you regarding the time line for implementing this feature within a week.
Kindly let me know if you have any other queries. Thanks for your patience.
Regards,
Manohari.R