插件开发点击按钮没反应

参考插件开发_基础.html
写了表单插件
在点击HellWorld的时候没反应，请问各位大神是什么原因？

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Kingdee.BOS.Core.Bill.PlugIn;
using Kingdee.BOS.Core.DynamicForm;
using Kingdee.BOS.Core.DynamicForm.PlugIn.Args;

namespace MyDev.K3.SCM.Stock.Business.PlugIn
{

public class ReceiptEdit : Kingdee.BOS.Core.Bill.PlugIn.AbstractBillPlugIn
{
public override void BarItemClick(BarItemClickEventArgs e)
{
base.BarItemClick(e);
if (e.BarItemKey == "HelloWorld")
{
this.View.ShowMessage("Hello world!", MessageBoxType.Notice);
}
}
}
}