UserControl里面：
public partial class WebUserControl : System.Web.UI.UserControl
{
    private  Boolean _IsVisable;
    public Boolean IsVisable
    {
        get
        {
            return _IsVisable;
        }
        set
        {
            _IsVisable = value;
        }
    }
    protected void Page_Load(object sender, EventArgs e)
    {
        this.Button1.Visible = _IsVisable;
    }
}

------解决方案--------------------
public CheckBox MyCheckBox
{
get
{
return this.MycheckBox;
}
}

然后在page上就可以操作这个checkboc 了