Easyui使用Dialog行内按钮布局

<p class="easyui-layout" data-options="fit:true"> 
 <p data-options="region:'north',split:false" 
 > 
 <p title="角色分配" > 
 <table cellpadding="12" cellspacing="0" > 
 <tr> 
 <td >角色名称:</td> 
 <td><input id="roleName" class="easyui-textbox" 
 ></td> 
 <td >角色功能:</td> 
 <td> 
 <select id="roleFun" class="easyui-combobox" data-options="editable:false,multiple:true,panelHeight:'400px'" ></select> 
 <p id="roleFunPanel"> 
 <ul id="roleFunTree" class="easyui-tree" data-options="animate: true,checkbox:true"> 
 <li>线路列表1</li> 
 <li>线路列表2</li> 
 <li>线路列表3</li> 
 </ul> 
 </p> 
 </td> 
 <td > 
 <a href="javascript:void(0)" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="easyui-linkbutton" data-options="iconCls:'icon-add',plain:true" onclick="newAppendRole()">添加</a> 
 </td> 
 </tr> 
 </table> 
 <table id="tblRoleDetail" ></table> 
 </p> 
 </p> 
 </p> 
 <p id="editRoleDialogFrame"></p>

var grid = $("#tblRoleDetail").datagrid({ 
 border : false, 
 striped : true, 
 rownumbers : true, 
 fitColumns : true, 
 singleSelect : true, 
 height: '90%', 
 width: '100%', 
 idField :'roleName', 
 plain : true, 
 fit : false, <span > </span> 
 selectOnCheck:false, 
 nowrap: true, 
 onClickRow : tblRoleDetailOnClickRow , 
 columns:[[ 
 {field:'roleName',title:'角色名',width: '19%',align:'center'}, 
 {field:'funId',title:'权限名称',width: '70%',align:'left', 
 formatter: function(value,row,index){ 
 return '<span title='+value+'>'+value+'</span>' 
 } 
 }, 
 {field:'opt',title:'操作',width:'10%',align:'center', 
 formatter:function(value,rec) 
 { 
 var btn1 = '<a class="editcls" onclick="newRoleEdit(\''+rec.roleName+'\')" href="javascript:void(0)" rel="external nofollow" rel="external nofollow" rel="external nofollow" >编辑</a>'; 
 var btn2 = '<a class="delecls" onclick="removeRole(\''+rec.roleName+'\')" href="javascript:void(0)" rel="external nofollow" rel="external nofollow" rel="external nofollow" >删除</a>'; 
 return btn1+btn2; 
 } 
 } 
 ]], 
 onLoadSuccess:function(data){ 
 $('.editcls').linkbutton({text:'编辑',plain:true,iconCls:'icon-edit'}); 
 $('.delecls').linkbutton({text:'删除',plain:true,iconCls:'icon-remove'}); 
 $('#tblRoleDetail').datagrid('fixRowHeight'); //固定所有高度，避免行号和行数据错位 
 } 
 });