Grid nest Grid

// row expander
    var acl_table_expander = new Ext.ux.grid.RowExpander({
        tpl:new Ext.Template(
        '<div style="padding-left:38" class="acl_sub_grid_div"></div>'
        )
    });
   acl_table_expander.on('expand', function(expander,record,body, rowIndex){
    window.testEle = body;
    if(Ext.DomQuery.select("div.x-panel-bwrap",body).length==0){
    //ACL 列表 subgrid start================================================   

var acl_sub_grid = new Ext.grid.GridPanel({
id:'acl_sub_grid',
        ......
......
renderTo:Ext.DomQuery.select("div.acl_sub_grid_div",body)[0],
    stateId: 'grid',
    listeners:{
    click:function(ev){
    Ext.getCmp("acl_grid").getSelectionModel().clearSelections(false);
    }
    }
});
//ACL 列表 subgrid start================================================
    }

    });