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i have notice that in another grid that i have with a checkbox it works fine

where is my grid

minutos = "00:00;15:15;30:30;45:45";
horas = "00:00;01:01;02:02;03:03;04:04;05:05;06:06;07:07;08:08;09:09;10:10;11:11;12:12;13:13;14:14;15:15;16:16;17:17;18:18;19:19;20:20;21:21;22:22;23:23";

jQuery(”#edit_hours”).jqGrid({
       url:'server.php',
    datatype: “json”,
     colNames:['Id','IdF','Funcionario','Seccao','Funcao','Dia','HH Ent','MM Ent','HH Sai','MM Sai','Total','Refeicao'],
       colModel:[
        {name:'id',index:'id', width:90,hidden:true},
        {name:'idF',index:'id_funcionario', width:30},
      {name:'funcionario',index:'funcionario', width:140},         
        {name:'seccao',index:'seccao_desc', width:120},
        {name:'funcao',index:'funcao_desc', width:90},
      {name:'data',index:'data', width:75,editable:true,sorttype:'date', datefmt:'Y-m-d'},       
      {name:'ent_horas',index:'ent_horas', width:55,editable:true,edittype:'select',align:"center",
        editoptions: {value:horas}},
        {name:'ent_min',index:'ent_min', width:57,editable:true,edittype:'select',align:"center",
        editoptions: {value:minutos}},
        {name:'sai_horas',index:'sai_horas', width:55,editable:true,edittype:'select',align:"center",
        editoptions: {value:horas}},
        {name:'sai_min',index:'sai_min', width:57,editable:true,edittype:'select',align:"center",
        editoptions: {value:minutos}},
        {name:'total',index:'total', width:48,editable:true,align:"center"},   
      {name:'extra',index:'extra', width:58,editable:true,align:"center"},   
    ],
       rowNum:50,
       rowList:[50,150,300],
       imgpath: 'themes/sand/images',
       pager: jQuery('#prowed3'),
       sortname: 'data',
    viewrecords: true,
    sortorder: “asc”,
    onSelectRow: function(id){
        if(id && id!==lastsel){
            jQuery('#edit_hours').restoreRow(lastsel);
            jQuery('#edit_hours').editRow(id,true);
            lastsel=id;
        }
    },
    height: 430,   
    width: 750,
    editurl: “edit.php,
    caption: “Editar Horas”
}).navGrid(”#prowed3″,{edit:false,add:false,del:false});
jQuery(”#t_rowed3″).height(25).hide().filterGrid(”edit_hours”,{gridModel:true,gridToolbar:true});
jQuery(”#edit_hours”).navGrid('#prowed3',{edit:false,add:false,del:false,search:false,refresh:false})
 .navButtonAdd(”#prowed3″,{caption:”Search”,
            title:”Toggle Search”,buttonimg:'themes/sand/images/find.gif',
                onClickButton:function(){
                    if(jQuery(”#t_rowed3″).css(”display”)==”none”) {
                        jQuery(”#t_rowed3″).css(”display”,”");
                    } else {
                        jQuery(”#t_rowed3″).css(”display”,”none”); } } });