How to grab control collection like the Table class does?

<ME:NewControl ID="tblCustomList" runat="server">
// ... these controls will be used in my UserControl.aspx
</ME:NewControl>

<asp:Table ID="tblNormal" runat="server">
  <asp:TableRow>
      <asp:TableCell>Thing 1</asp:TableCell>
      <asp:TableCell>Thing 2</asp:TableCell>
  </asp:TableRow>
</asp:Table>

<ME:NewControl ID="tblCustomList" runat="server">
  <asp:TableRow>
      <asp:TableCell>Thing 1</asp:TableCell>
      <asp:TableCell>Thing 2</asp:TableCell>
  </asp:TableRow>
</ME:NewControl>

public TableRow DTHeader { get; set; }

protected override void OnInit(EventArgs e)
{
    tblCollection.Rows.Add(DTHeader);
    base.OnInit(e);
}

<ME:NewControl ID="tblCustomList" runat="server">
    <DTHeader>
        <asp:TableCell></asp:TableCell>
        //...
    </DTHeader>
</ME:NewControl>

using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Security.Permissions;

namespace Samples.AspNet.CS.Controls
{
    [AspNetHostingPermission(SecurityAction.Demand,
        Level = AspNetHostingPermissionLevel.Minimal)]
    public sealed class CustomTableCreateControlCollection : Table
    {
        protected override ControlCollection CreateControlCollection()
        {
            // Return a new ControlCollection
            return new ControlCollection(this);
        }
    }
}