jQuery Grid Plugin - jqGrid

Hi,

i am trying to implement the delete feature but i have problems submitting the key of the row. Of course this should be handled by jqgrid correct? Can you gimme a hint why the resulting request is only the call to the defined URL without any parameter (key) in it?

$(document).ready(function() {
            jQuery("#list4").jqGrid({
                url:'/foo/country/CountryManager2.app',
                editurl:"/foo/country/CountryManager2.app",
                datatype: "json",
                colNames:['ISO Num.','ISO Alpha', 'Bezeichnung', 'PLZ','Waehrung'],
                colModel:[
                    {name:'isoCodeNr',index:'isoCodeNr', width:85, key:true},
                    {name:'nameIsoCode2',index:'nameIsoCode2', width:90},
                    {name:'name',index:'name asc, invdate', width:180},
                    {name:'postalCode',index:'postalCode', width:80, align:"right"},
                    {name:'currencyName',index:'currencyName', width:90, align:"right"}
                ],
                rowNum:10,
                rowList:[10,20,30],
                pager: '#pjmap',
                sortname: 'nameIsoCode2',
                viewrecords: true,
                sortorder: "desc",
                jsonReader: {
                    repeatitems : false,
                    root:"records",
                    page: "currPage",
                    total: "totalPages",
                    records: "totalRecords",
                    id: "0"
                },
                caption: "JSON Mapping",
                height: '100%' });

            jQuery("#list4").jqGrid('navGrid', '#pjmap',
            {add:false,edit:false,del:true,search:false},
            {},
            {},
            {
                mtype:"DELETE"
            });
        });

Thx for hints. I googled and tried for hours without success. I still think that i dont need to get into the whole event thing myself (override) because the demos told me that this is not needed. Perhaps i have a problem with my jsonreader not recognizing the key or something.

Marc