Thank you Srinivasan,
it is exactly what I needed. Thank you again !
with your example it's all ok, but I have now a little extra problem.
In the dropped sfDataGrid I have a GridHyperlinkColumn column beside other columns.
I manage this column using the SfDataGrid.CurrentCellRequestNavigate event in order to navigate to another form of my app when the user clicks on cell of that column.
As soon as I substitute the default grid controller with GridSelectionControllerExt as you've done in your example, no SfDataGrid.CurrentCellRequestNavigate event is recalled yet when the user clicks on the hyperlinks.
What can I do to solve this little problem ?
Thank you Balamurugan,
I see how in your example everything works fine.
Probably my example is more complicated and there are other changes I have made.
If I'm able to isolate the problem in a simple way that can be evaluatable for you, I'll send you an example.
Meanwhile thank you for your help.