HEllo,

Yes it is possible and you can do what you want logic. The idea is to use the onSelectRow event.

Go into the demo

http://trirand.com/blog/jqgrid/jqgrid.html

Open the Row editing tree item and then Using Events example.

Replace the onSelectRow event with this:

onSelectRow: function(id)

{ if(id && id!==lastsel) {