<InsertItemTemplate>
            <tr>
                <td></td>
                <td class="colRef">
                    <asp:DropDownList ID="lstSetting" OnSelectedIndexChanged="lstSetting_SelectedIndexChanged"  SelectMethod="GetSettings" AutoPostBack="true" runat="server"></asp:DropDownList>
                </td>
                <td class="colRef">
                    <asp:DropDownList ID="lstValues"  runat="server"></asp:DropDownList>
                </td>

                <td class="colBtnRef">
                    <asp:ImageButton ToolTip="Создать" CommandName="Insert" ID="imgInsert" ImageUrl="~/Content/Pic1C/Сложение.bmp" runat="server" />
                </td>
                <td></td>
            </tr>
        </InsertItemTemplate>

        protected void lstSetting_SelectedIndexChanged(object sender, EventArgs e)
        {

            System.Web.UI.WebControls.DropDownList ddl; //lstValues
            ddl = (DropDownList)FindControl("lstValues");
            if (ddl != null)
            {
                ddl.SelectMethod = "GetValuesSorting";
                ddl.DataBind();
            }
        }

        public IEnumerable GetValuesSorting()
        {
            return Enum.GetValues(typeof(enSorting));
        }