jQuery Grid Plugin - jqGrid

Hello,

I want to use groupColumnShow to group a field type.

By cons when adding or editing I wish I could have access to this field regourpement but it is not even to the parameters: editable: true
 : (

Is there a trick, or it is not possible?

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Here is my code:

               jQuery("#ListeUtilisateur").jqGrid({
                                       url:'droits_groupes_liste_json.php',
                                       datatype: "json",
                                       mtype: "POST",
                                       colNames:['ID','Zone','Groupe','Note'],
                                       colModel:[
                                                 {name:'IDGroupe',index:'IDGroupe', width:55,align:"center"},
                                                 {name:'NameRoleZone',index:'NameRoleZone', width:200,editable:true, edittype:'select', editoptions:{dataUrl:'droits_groupes_liste_options.php?option=1'}},
                                                 {name:'Groupe',index:'Groupe', width:200,editable:true,editoptions:{size:30} },
                                                 {name:'Note',index:'Note', width:450,search:false,editable: true,edittype:"textarea", editoptions:{rows:"2",cols:"30"}},
                                                 ],
                                       rowNum:10,
                                       rowList:[10,20,30,50,100],
                                       pager: '#ListeUtilisateur_pager',
                                       sortname: 'IDGroupe',
                                       viewrecords: true,
                                       sortorder: "desc",
                                       height: 350,
                                grouping:true,
                                groupingView : {
                                        groupField : ['NameRoleZone'],
                                    groupColumnShow : [false]
                                },
                                       caption:"Groupe"
                                       });
               jQuery("#ListeUtilisateur").jqGrid('navGrid','#ListeUtilisateur_pager',{edit:true,add:true,del:true,search:false});
               jQuery("#ListeUtilisateur").jqGrid('filterToolbar',{stringResult: true,searchOnEnter : false,defaultSearch:'cn'});