var store_intervencoes =  new Ext.data.GroupingStore({
                    reader: new Ext.data.JsonReader({
                    root:'rows',
                    autoLoad: false,
                    type : 'ajax',
                    //remoteGroup: false,
                    groupField: 'street',
                    fields:[{ name:'street', type:'integer'},
                        { name:'intervenction', type:'string'},
                        { name:'priority', type:'integer'},
                        { name:'value', type:'string'}]
                    })
            });


var gridPanel = new Ext.grid.GridPanel({
                header: false,
                store: store_intervencoes,
                selModel: new Ext.grid.RowSelectionModel({singleSelect:false}),
                layout: 'fit',
                height: 300,
                width: 1000,
                columnLines: true,
                cls: 'grid_intervencoes',
                autoScroll: true,
                stripeRows: true,
                autoFill : true,
                viewConfig: { emptyText: 'nothing', deferEmptyText: false },
                groupField: 'street',
                view: new Ext.grid.GroupingView({
                            forceFit:true,
                            autoHeight: true,
                            autoFill : true,
                            groupTextTpl: '{text} ({[values.rs.length]} {[values.rs.length > 1 ? "Items" : "fk_n_rua"]})'
                                            }),
                columns: [{
                    //header: "Nome",
                    //sortable: true,
                    dataIndex: "intervenction",
                    //width: 450
                    },{
                    //header: "Prioridade",
                    //sortable: true,
                    dataIndex: "priority",
                    //width: 50
                    },{
                    //header: "Custo" + ' \u20AC',
                    //sortable: true,
                    dataIndex: "value",
                    //width: 50
                    },{
                    //header: 'Trecho',
                    //sortable: true,
                    dataIndex: "street",
                    //width: 50,
                    //groupable: true
                    }],
                    collapsible: true,
                    animCollapse: false,
                    title: 'Grouping Example',
                    iconCls: 'icon-grid',
                    fbar  : [{
                        xtype: 'numberfield',
                        id: 'total',
                        name: 'total',
                        fieldLabel: 'Total',
                        value: '0',
                        readOnly: true,
                        fieldCls: 'valores'
                    }]
                });