Custom Controls: Extra Property Tab

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

namespace Elsehemy.Controls
{
    [Designer(typeof(UserControlDesigner))]
    [PropertyTab(typeof(ExtraSuperTab), 
          PropertyTabScope.Component)]
    public partial class TestUserControl : UserControl
    {
        public TestUserControl()
        {
            InitializeComponent();
        }
        int _x;

        public int XXX
        {
            get { return _x; }
            set { _x = value; }
        }
    }


    public class ExtraSuperTab : 
         System.Windows.Forms.Design.PropertyTab
    {
        public override PropertyDescriptorCollection
         GetProperties(object component, 
                        Attribute[] attributes)
        {
            PropertyDescriptor pd = 
               TypeDescriptor.CreateProperty(
                          component.GetType(),
                          "XXX",
                           typeof(int), 
             new CategoryAttribute("Super Properties"));

            return (
                new PropertyDescriptorCollection(
                         new PropertyDescriptor[]{pd}
                                               ));
        }

        public override string TabName
        {
            get { return "Super Tab"; }
        }

        public override System.Drawing.Bitmap Bitmap
        {
            get
            {
                return (System.Drawing.Bitmap)System.
                  Drawing.Image.FromFile(@"C:\icon.jpg");
            }
        }
    }
}

And in the control don't forget the attribute

[PropertyTab(typeof(ExtraSuperTab),
       PropertyTabScope.Component)] 
public partial class TestUserControl : UserControl

Via Amr Elsehemy's Blog