jQuery Grid Plugin - jqGrid

Hello,

My tree is not closed !!!

Here is the return the first time :

{"rows":[{"cell":["CES ",30479.91,"00410459@2009@000000000000000@000000000000000@000000000000002@CES",0.0,0.0,false,false],"id":0},{"cell":["DAV ",35.98,"00410459@2009@000000000000001@000000000000000@000000000000002@DAV",0.0,0.0,false,false],"id":1},{"cell":["DDG ",1308.21,"00410459@2009@000000000000002@000000000000000@000000000000002@DDG",0.0,0.0,false,false],"id":2}],"page":"1","records":2,"total":"1"}

and the second when i click on the line

{"rows":[{"cell":[" ",17.99,"00410459@2009@000000000000003@000000000000001@000000000000004@",1.0,1.0,true,false],"id":3},{"cell":[" ",17.99,"00410459@2009@000000000000004@000000000000001@000000000000004@",1.0,1.0,true,false],"id":4}],"page":"1","records":2,"total":"1"}

The expand is ok but when i click again for close that don't close ????

$("#listBase").jqGrid({
        datatype: "json",
        mtype: 'GET',
        height: 250,
        url: "<html:rewrite forward='detail' />",
        postData:{action:"ajax", cleDB:cleDB},
           width: 600,
           colNames:[
                 "<bean:message key='baws.declarant.compteur'/>",
               "<bean:message key='baws.declarant.montant'/>",
               "cleDB"
               ],
        colModel:[
            {name:'compteur',index:'compteur', width:180, sortable:false, resizable:false},
               {name:'montant',index:'montant', width:180, align:'right', sortable:false, resizable:false},
               {name:'cleDB',index:'cleDB', hidden:false,  sortable:false, resizable:true, key:true}
               ],
           treeGrid: true,
           treeGridModel: 'adjacency',
           ExpandColumn : 'compteur',
           ExpandColClick: false,
           scrollOffset: 0,
           treeIcons:{
               plus:'ui-icon-circlesmall-plus',
               minus:'ui-icon-circlesmall-minus',
               leaf:'ui-icon-radio-off'
           }
    });

JQGRID version 3.6.5 on IE6.

Regards.