asp.net – 自定义控件变为通用的“UserControl”,而不是其在Des

<%@ Control Language="vb" AutoEventWireup="false" CodeBehind="MyControl.ascx.vb" Inherits="Mynamespace.Controls.MyControl" %>

<!-- some html and other custom controls-->

并在代码背后：

Namespace Controls

    Public Class MyControl
        Inherits System.Web.UI.UserControl

这是在图书馆中设置的.不同的项目在页面中使用该控件：

<%@ Page Language="vb" AutoEventWireup="false" CodeBehind="mypage.aspx.vb" 
    Inherits="myproject.mypage" culture="auto" meta:resourcekey="Page" uiculture="auto" 
    Transaction="RequiresNew" MasterPageFile="Mynamespace.Master" 
    Theme="ThemeBase2" StylesheetTheme="ThemeBase2" %>

<%@ Register tagprefix="Controls" tagname="MyControl" src="../Controls/MyControl.ascx" %>

<%-- some asp.net --%>

<Controls:MyControl ID="mycontrol1" runat="server" 
                    MyCustomProperty="value" />

但是,当我建立,我得到一个错误说

‘MyCustomProperty’ is not a member of ‘System.Web.UI.UserControl’.

而在designer.vb页面中我看到：

Protected WithEvents mycontrol1 As Global.System.Web.UI.UserControl

如何确保它成为：

Protected WithEvents mycontrol1 As Global.Mynamespace.Controls.MyControl

？