Combobox garde le focus

Bonjour,

J'ai un combo, avec 3 evenements persos (Enter, DropDown, DrawItem). Lorsque je clic à coté, il conserve le focus !??

Code:

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 comboBoxLibelleRestoria.Enter += new EventHandler(comboBoxLibelleRestoria_Enter);
            comboBoxLibelleRestoria.DrawMode = DrawMode.OwnerDrawFixed;
            comboBoxLibelleRestoria.DrawItem += new DrawItemEventHandler(comboBoxLibelleRestoria_DrawItem);                
            comboBoxLibelleRestoria.DropDown += new EventHandler(comboBoxLibelleRestoria_DropDown);

Code:

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void comboBoxLibelleRestoria_Enter(object sender, EventArgs e)
        {
            if (comboBoxLibelleRestoria.Items.Count == 0)
            {
                var item = Util.ListArticles.Values.FirstOrDefault(art => art.ELEMENT_REPAS == this.labelElement.Text && art.LIBELLE_RESTORIA == comboBoxLibelleRestoria.Text);
                PopulateComboboxLibelleRestoria(this.labelElement.Text);
                comboBoxLibelleRestoria.SelectedItem = item;
            }
        }

Code:

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 void comboBoxLibelleRestoria_DrawItem(object sender, DrawItemEventArgs e)
        {
            Article item = (Article)((ComboBox)sender).Items[e.Index];
            var lib = getArticleLibelleRecherche(item);
 
            e.DrawBackground();
            using (SolidBrush br = new SolidBrush(e.ForeColor))
            {
                e.Graphics.DrawString(lib, e.Font, br, e.Bounds);
            }
            e.DrawFocusRectangle();
        }

Code:

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void comboBoxLibelleRestoria_DropDown(object sender, EventArgs e)
        {
            ComboBox senderComboBox = (ComboBox)sender;
            int width = senderComboBox.DropDownWidth;
            Graphics g = senderComboBox.CreateGraphics();
            Font font = senderComboBox.Font;
            int vertScrollBarWidth =
                (senderComboBox.Items.Count > senderComboBox.MaxDropDownItems)
                ? SystemInformation.VerticalScrollBarWidth : 0;
 
            int newWidth;
            foreach (Article art in ((ComboBox)sender).Items)
            {
                newWidth = (int)g.MeasureString(getArticleLibelleRecherche(art), font).Width
                    + vertScrollBarWidth;
                if (width < newWidth)
                {
                    width = newWidth;
                }
            }
            senderComboBox.DropDownWidth = width;            
        }

Quelqu'un aurait une idée ? un contournement ?