简化代码如下：
var newwin = new top.Ext.Window({
id: "newwin",
items: [
{xtype: "form"},
items: [{ fieldLabel: "实际付款", id: "O_OCollection", xtype: 'textfield' }]
]
}]
我想在表单里面的实际付款这个text后面加个按钮该怎么做

{
text: '选择岗位',
id:'selectDuty2',
　　 xtype: 'button',
labelWidth:60,
width:60,
handler : function() {
//弹出窗口-------------
if(win_2==undefined){
win_2 = Ext.createWidget('window', {
width:560,
height:300,
closable : false,
draggable : true,
animCollapse: false,
layout: 'fit',
modal:true,
items:[tree]
});
}
win_2.show();
selectIndexId=1;
Ext.yh.method.reloadStore({
"store":treeStore
});
}
},