dll defectueuse (etat bouton)

Bonjour,
Voila j'ai pondu tout ce code et voila que je n'arrive pas à savoir pourquoi l'état désactiver"Disiable" ne s'active pas (tout les autre marche). J'ai cherché et encore cherché mais je trouve rien :(

Merci d'avance de m'aider.
Code:
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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Windows.Forms;
 
namespace UC_RichIcone
{
    [DefaultEvent("Click")]
    public partial class UC_RichIcon : UserControl
    {
        public enum StateType { Disabled, Neutral, Over, Clicked };
        private StateType StateButton;
        private Image m_ImageNormal = null;
        private Image m_ImageClick = null;
        private Image m_ImageOver = null;
        private Image m_ImageDisiable = null;
        private bool Enable = false;
 
        public UC_RichIcon()
        {
            InitializeComponent();
        }
 
        private void UC_RichIcon_Load(object sender, EventArgs e)
        {
            this.BackgroundImageLayout = ImageLayout.Stretch;
            this.BackgroundImage = m_ImageNormal;
        }
        [Description("Etat du button")]
        public StateType EtatBouton
        {
            get { return StateButton; }
            set
            {
 
                StateButton = value;
                if (StateButton == StateType.Disabled && m_ImageDisiable != null)
                    this.BackgroundImage = m_ImageDisiable;
                if (StateButton == StateType.Clicked && m_ImageClick !=null)
                    this.BackgroundImage = m_ImageClick;
                if (StateButton == StateType.Neutral && m_ImageNormal !=null)
                    this.BackgroundImage = m_ImageNormal;
                if (StateButton == StateType.Over && m_ImageOver !=null)
                    this.BackgroundImage = m_ImageOver;
                // On refresh le contrôle
                this.Refresh();
            }
        }
        [Description("si la propriete est pas init , disable est par default")]
        public bool IsEnable
        {
            get { return Enable; }
            set
            {
                Enable = value;
                if (!Enable)
                    StateButton = StateType.Disabled;
                if(!Enable && m_ImageDisiable != null)
                    this.BackgroundImage = m_ImageDisiable;
                else if(m_ImageNormal != null)
                    this.BackgroundImage = m_ImageNormal;
                // On refresh le contrôle
                this.Refresh();
            }
        }
 
        [Description("image etat normal")]
        public Image ImageNormal
        {
            get { return m_ImageNormal; }
            set { m_ImageNormal = value; this.Refresh(); }
        }
        [Description("image etat cliquer")]
        public Image ImageClick
        {
            get { return m_ImageClick; }
            set { m_ImageClick = value; this.Refresh(); }
        }
        [Description("image etat mouse over")]
        public Image ImageOver
        {
            get { return m_ImageOver; }
            set { m_ImageOver = value; this.Refresh(); }
        }
        [Description("image etat desactivé")]
        public Image ImageDisiable
        {
            get { return m_ImageDisiable; }
            set { m_ImageDisiable = value; this.Refresh(); }
        }
 
        private void UC_RichIcon_MouseUp(object sender, MouseEventArgs e)
        {
            if (Enable)
            {
                StateButton = StateType.Over;
                if (m_ImageOver != null)
                    this.BackgroundImage = m_ImageOver;
            }
        }
 
        private void UC_RichIcon_MouseDown(object sender, MouseEventArgs e)
        {
            if (Enable)
            {
                StateButton = StateType.Clicked;
                if(m_ImageClick !=null)
                    this.BackgroundImage = m_ImageClick;
            }
        }
 
        private void UC_RichIcon_MouseLeave(object sender, EventArgs e)
        {
            if (Enable)
            {
                StateButton = StateType.Neutral;
                if (m_ImageNormal != null)
                    this.BackgroundImage = m_ImageNormal;
            }
        }
 
        private void UC_RichIcon_MouseEnter(object sender, EventArgs e)
        {
            if (Enable)
            {
                StateButton = StateType.Over;
                if (m_ImageOver != null)
                    this.BackgroundImage = m_ImageOver;
            }
 
        }
 
    }
}