哪个属性存储GroupBox包含的控件?

是否有其他属性存储这些控件?

编辑:下面是groupbox代码:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Text;
using System.Windows.Forms;
using System.Drawing.Drawing2D;

namespace CustomControls
{
    public partial class CustomGroupBox : GroupBox
    {
        public CustomGroupBox ( )
        {
            this.OutlineColor = Color.FromArgb ( 5, 5, 5 );
            this.Font = new Font ( "Tahoma", 8.25F, FontStyle.Regular );
        }

        Color outlineColor;

        [DefaultValue ( typeof ( Color ), "5, 5, 5" )]
        public Color OutlineColor
        {
            get { return outlineColor; }
            set { outlineColor = value; Invalidate ( ); }
        }

        [DefaultValue ( typeof ( Font ), "Arial, 8.25pt" )]
        public override Font Font
        {
            get { return base.Font; }
            set { base.Font = value; }
        }

        protected override void OnPaint ( PaintEventArgs pe )
        {
            //painting
        }
    }
}