EasyUI点击datagrid某行，弹出 layout

源码如下：

<div class="easyui-layout" fit="true" id='rolelayout'>
    <div region="center" style="border-bottom: none;">
        <table id="bt_role_grid"></table>
    </div>
    <div region="south" style="height: 250px;padding: 2px;" title="角色" collapsed="true" split='true'>
      <table id="bt_role_user_grid"></table>
    </div>
</div>
datagrid的onClickRow事件：
  onClickRow: function(rowIndex, rowData) {
            var $layout = $('#rolelayout');
            var south = $layout.layout('panel', 'south');
            if (south.panel('options').collapsed) {
                $layout.layout('expand', 'south');
            }

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