关于CreateControl方法问题！

老师们，这是我写的代码using System;using System.Collections.Generic;
using System.Linq;
using System.Text;
using Kingdee.BOS.Core;
using Kingdee.BOS.Core.DynamicForm.PlugIn.Args;
using Kingdee.BOS.Core.Bill.PlugIn.Args;
using Kingdee.BOS.Core.Metadata.ControlElement;
using Kingdee.BOS.Core.DynamicForm.PlugIn;
using Kingdee.BOS.Business.PlugIn;
namespace qazwsx
{
public class qazwsx : AbstractDynamicWebFormBuilderPlugIn
{
public override void CreateControl(CreateControlEventArgs e)
{
base.CreateControl(e);
if (e.ControlAppearance.Key.Equals("FList"))
{

e.Control["enforcemerge"] = true;

}

}
}
}
为什么我在单据的表单插件上注册不成功？