Probleme+Changement d'index de DropDownList

Bonsoir,

Fichier .ascx

Code:

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<asp:DropDownList ID="Ddl_client_country" runat="server" AutoPostBack="True" OnSelectedIndexChanged="Ddl_client_country_SelectedIndexChanged" OnTextChanged="Ddl_client_country_TextChanged">
                            </asp:DropDownList>

Code behind

Code:

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         protected void Ddl_client_SelectedIndexChanged(object sender, EventArgs e)
        {
            ShowHide();
        }
 
        private void ShowHide()
        {
            if (Ddl_client.SelectedItem.Text.ToString() == "Non")
            {
                Ddl_client_agence.Enabled = false;
                Ddl_client_country.Enabled = false;
            }
            if (Ddl_client.SelectedItem.Text.ToString() == "Oui")
            {
                Ddl_client_agence.Enabled = true;
                Ddl_client_country.Enabled = true;
            }
        }

dans le cas ou je choisi le premier Item de la dropdownList, il faut le postBack mais ne rentre pas dans le gestionnaire d'evenement SelectedIndexChanged