Adding custom control dynamically

Hi
i have created a custom control that has a
label and Textbox
i dont face any problem when dynamically adding custom control to page but when i try to access sub controls i get NullPointException.
Controls_TextOptionList is my custom control
<%@ Control Language="C#" AutoEventWireup="true" CodeFile="TextOptionList.ascx.cs" Inherits="Controls_TextOptionList" %> <div> <div > <div > <asp:TextBox ID="txtInput" runat="server" ></asp:TextBox></div> </div> <div > <div > <asp:Label ID="lblOptionList" runat="server" Text="Default Text"></asp:Label></div> </div> </div>


Controls_TextOptionList tbList = new Controls_TextOptionList(); Label lbl = ((Label)t ...