TreeGrid allows you to expand or collapse group rows.
<table title="Folder Browser" class="easyui-treegrid" style="width:700px;height:250px"
data-options="
url: 'examples/treegrid/treegrid_data1.json',
method: 'get',
rownumbers: true,
idField: 'id',
treeField: 'name'
">
<thead>
<tr>
<th data-options="field:'name'" width="220">Name</th>
<th data-options="field:'size'" width="100" align="right">Size</th>
<th data-options="field:'date'" width="150">Modified Date</th>
</tr>
</thead>
</table>