Please try this:
<div id="buttons">
<input class="easyui-searchbox" style="width:100px">
<a href="#" class="easyui-linkbutton" iconCls="icon-add" plain="true"></a>
</div>
<script type="text/javascript">
$(function(){
var pager = $('#dg').datagrid('getPager');
pager.pagination({
buttons:'#buttons'
})
})
</script>