Custom GroupBox in C# with 2 text box and 1 button

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C#

i am trying to make a custom group box and here is my code

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.ComponentModel;
using System.Drawing;

namespace CustomLogin
{
    public partial class CLogin : GroupBox
    {
        TextBox TBOX = null;
        TextBox PBOX = null;
        Label lblUName = null;
        Label lblPass = null;
        Button btnLog = null;

        Color waterMarkColor = Color.Red;
        Color forecolor;
        Font font;
        Font waterMarkFont;

        //Color waterMarkColor = Color.Red;
        string UText = "Username";
        string PText = "Password";
        string btnLogin = "&Login";

        public CLogin()
        {
            InitializeComponent();

        }

        public CLogin(IContainer container)
        {
            this.forecolor = this.ForeColor;
            this.ForeColor = this.waterMarkColor;
            this.font = this.Font;

            TBOX = new TextBox();
            PBOX = new TextBox();

            lblUName = new Label();
            lblPass = new Label();

            lblUName.Text = UText;
            lblPass.Text = PText;

            btnLog = new Button();

            btnLog.Text = btnLogin;

            this.Controls.Add(TBOX);
            this.Controls.Add(PBOX);

            this.Controls.Add(lblUName);
            this.Controls.Add(lblPass);

            this.Controls.Add(btnLog);

            TBOX.Location = new Point(59, 39);
            PBOX.Location = new Point(59, 77);

            lblUName.Location = new Point(18, 42);
            lblPass.Location = new Point(18, 80);

            btnLog.Location = new Point(83, 104);
        
            container.Add(this);

            InitializeComponent();
        }
        

        [Browsable(true)]
        [Category("Extended Properties")]
        [Description("sets TextBox text")]
        [DisplayName("Title")]
        public new string Text
        {
            get
            {
                //required for validation for Text property
                return base.Text.Replace(this.UText, string.Empty);
            }
            set
            {
                base.Text = value;
            }

        }

        [Browsable(true)]
        [Category("Extended Properties")]
        [Description("sets TextBox text")]
        [DisplayName("Log-By")]
        public new string username
        {
            get
            {
                //required for validation for Text property
                return lblUName.Text.Replace(this.UText, string.Empty);
            }
            set
            {
                lblUName.Text = value;
            }

        }
    }
}

and the problem is that when i take my custom groupbox on winfrom from toolbox its show only group box it is not showing textboxs and button but when i debug my project and run it all textbox and button are shown..... i want to show textboxs and button on winform when i take custom groupbox on winform from tool box...... plz help me plz