PasswordRecovery asp.net控件

我正在尝试访问submit按钮，它是asp.net 2.0中PasswordRecovery控件的一部分。据我所知，API不允许这样做

有人知道我如何在点击这个按钮时添加Javascript确认弹出窗口吗

我尝试在SendingMail事件中向PasswordRecovery控件的属性添加onclick，如下所示，但没有成功

 protected void PasswordRecovery1_SendingMail(object sender, MailMessageEventArgs e)
    {
        //storing audit information
        PasswordRecovery myPasswordRecovery = new PasswordRecovery();
        myPasswordRecovery = (PasswordRecovery)sender;
        myPasswordRecovery.SubmitButton.Attributes.Add("onclick", "return confirm('" + confirmationMessage + "');");

---

}

尝试访问按钮时是否指定了模板，例如：

passwordRecovery.UserNameTemplateContainer.FindControl("submitButton")

---

我将尝试模板控件并替换submit按钮

<asp:Button ID="SubmitButton" runat="server" CommandName="Submit" Text="Submit" ValidationGroup="PasswordRecovery1" OnClientClick="return confirm('You sure you want to recover?');" />