It\'s an addition for previous my question about adding columns into jqGrid-based table. Here my new js-code:
var col_names = [\'First\', \'Second\', \'Third
try not to Destroy/Create, but .trigger("reloadGrid");
.trigger("reloadGrid");
UPD:: try to pass loadonce:false to grid creation params
UPD2:: Seemed like jQgrid cant operate with column changes "On fly". Try to destroy first grid and create another one instead of it.