Extjs:添加查看全部按钮

    var grid =new Ext.grid.GridPanel({
        renderTo:'tsllb',
        title:'产品成本列表',
        selModel:csm,
        height:350,
        columns:[
                 csm,
                 {header: "编码", dataIndex: "bm", sortable: true,hidden:true},
                 {header: "产品", dataIndex: "cp", sortable: true},
                 {header: "成本", dataIndex: "cb", sortable: true,align:'left'}
                 ],
        store:store,
        tbar:new Ext.PagingToolbar({
            id:'bbar',
            emptyMsg:"没有数据",
            displayInfo:true,
            displayMsg:"显示从{0}条数据到{1}条数据，共{2}条数据",
            store:store,
            pageSize:50
        }),
        bbar:[{
                pressed: true,
                enableToggle:true,
                text: '查看全部',
                toggleHandler: function(btn, pressed){
                    search(10000);
                }
            }]
});

    var search = function(pageSize){
        store.load({
            params:{start:0,limit:pageSize,param:param}});
        Ext.getCmp("bbar").pageSize=pageSize;
    }