{name:”nm_id”, index:”nm_id”, edittype:'select', stype:'select', formatter:'select', editable:true,
editoptions:{onchange:'group_changed()', value:data[0]}, width:120}
{name:”ma_idnmx”, index:”ma_idnmx”, edittype:'select', stype:'select', formatter:'select', editable:true,
editoptions:{value:data[1]}, width:120}

Thank, event really are operated correctly, but function
function group_changed(){
$(“#my_grid”).setColProp('ma_idnmx', { editoptions: { value: “1:one;2:two;3:three”} });
}
don't realize renovation in a list, what we want.

next reference cause alarm for me, that it is not possible:
http://www.trirand.com/blog/?page_id=393/help/setcolprop-editoptions-does-not-update-drop-down-in-search-toolbar/