Extjs添加行双击事件

var grid = new Ext.grid.GridPanel({
        store: store,
        trackMouseOver: false,
        disableSelection: true,
        autoHeight: true,
        autoWidth: true,
        autoScroll: true,
        viewConfig: {
            forceFit: true
        },
        loadMask: true,
        sm: new Ext.grid.RowSelectionModel({ singleSelect: true }),
        columns: [new Ext.grid.RowNumberer(), {
            header: '录音文件名',
            dataIndex: 'FileName',
            sortable: true
        }]
    });

    grid.addListener('rowdblclick', rowdblclickFn);

    function rowdblclickFn(grid, rowindex, e) {
        var select = grid.getSelectionModel();
        var data = select.getSelected().data;
        var filename = data.FileName;
        alert(filename);
    }