小弟我用C＃写了一个自定义登录控件，增加了事件响应机制 但点击登录或重置控件时事件却无响应，到底错哪了？以下是自定义控件代码

我用C＃写了一个自定义登录控件，增加了事件响应机制 但点击登录或重置控件时事件却无响应，到底哪里错了？以下是自定义控件代码
using   System;
using   System.Web.UI;
using   System.Web.UI.Design;
using   System.Web.UI.WebControls;
using   System.ComponentModel;
using   System.Web.Security;
namespace   kongjian
{
///   <summary>
///   LoginCustomControl   的摘要说明。
///   </summary>
[DefaultProperty( "Text "),  
DefaultEvent( "ItemChanged "),   //双击响应
ParseChildren(true),
Description( "Login   Control "),
Designer(typeof(kongjian.LoginControlDesigner)),//指定了登录控件的设计器类
ToolboxData( " <{0}:LoginCustomControl   runat=server> </{0}:LoginCustomControl> ")]
public   class   LoginCustomControl   :   System.Web.UI.WebControls.WebControl
{
public   static   string   USERNAME_STRING   =   "用户名: ";
public   static   string   PASSWORD_STRING   =   "密&nbsp;&nbsp;码: ";//两个字中间留空格
public   static   string   LOGIN_STRING   =   "登录 ";
public   static   string   RESET_STRING   =   "重置 ";
public   static   string   CAPTION_STRING   =   "用户登录 ";
public   static   string   REGISTER_STRING   =   "注册新用户 ";

private   TextBox   tbUserName;
private   TextBox   tbPassword;
private   Button   btnLogin;
private   Button   btnReset;
private   LiteralControl   vUserName;
private   LiteralControl   vPassword;
private   LinkButton   lbRegister;
private   bool   _show_register;

public   event   EventHandler   Login;
public   event   EventHandler   Reset;
public   event   EventHandler   Register;

protected   void   OnLogin(EventArgs   e)
{
if   (Login   !=   null)
{
Login(this,   e);
}
}

protected   void   OnReset(EventArgs   e)
{
if   (Reset   !=   null)
{
Reset(this,   e);
}
}

protected   void   OnRegister(EventArgs   e)
{
if   (Register   !=   null)
{
Register(this,   e);
}
}

public   string   UserName  
{
get  
{
this.EnsureChildControls();
return   tbUserName.Text;
}
set  
{
this.EnsureChildControls();
tbUserName.Text   =   value;
}
}

public   string   Password  
{
get  
{
this.EnsureChildControls();
return   tbPassword.Text;
}
set  
{
this.EnsureChildControls();
tbPassword.Text   =   value.ToString();
}
}

[
Browsable(true),
Category( "Behaviour "),
Description( "是否显示注册新用户链接 ")
]
public   bool   ShowRegister
{
get
{
return   _show_register;
}
set
{
_show_register   =   value;
}
}
protected   override   void   CreateChildControls()
{
base.CreateChildControls   ();

//文本