Hi Rajani,
Sorry for the inconvenience caused.
I have created a sample as per your specification.
Attached sample works fine with the vertical scroll''s automatic mode in a GroupingGrid.
To track down what is causing this problem, you could try commenting out all this code, and then just assign the datasource in a grid adding only the minimal code shown in the sample that works. If this simple code works, you could start adding other pieces of the original code until this breaks. Maybe this would point to what is failing.
If you can send us a sample that does not work, we can try to debug it here.
Thanks for your co-operation.
Regards,
Haneef