Trouble using 3 modalpopUpExtender in same pages

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C#

ASP.NET

Hi,
I'm using 4 ModalPopupExtenders on a single page. One works perfectly and the other does not. The others are called via codeBehind and every time one is triggered by a button all open at the same time.
I have tried putting BehaviorID, but to no avail.


How can I resolve this. Anyone have any ideas?

<!-- PopUp para exibir histórico de Versões-->

            <asp:UpdatePanel runat="server">
                <Triggers>
                    <asp:PostBackTrigger ControlID="btnVisualizar" />
                </Triggers>
                <ContentTemplate>

                    <asp:Panel runat="server" ID="pnlHistoricoVersoes" CssClass="divFundoModalAJAX">
                        <div class="divCaixaMensagemAJAXHistoricoVersoes">
                            <div class="divRibbonMensagemAJAX">
                            </div>
                            <div style="padding: 10px; margin-removed 37px;">
                                <asp:Label ID="Label15" CssClass="cabecalhoPopUp" runat="server">Versões Anteriores</asp:Label><br />
                                <div style="overflow: auto; overflow-x: hidden; max-height: 400px;">
                                    <asp:GridView ID="gvHistoricoPli" runat="server" AutoGenerateColumns="False" DataKeyNames="pli" AllowPaging="true"
                                        OnRowDataBound="gvHistoricoPli_RowDataBound" CssClass="gvHistorico mGrid" OnPageIndexChanging="gvHistoricoPli_PageIndexChanging" OnSelectedIndexChanged="gvHistoricoPli_SelectedIndexChanged">
                                        <Columns>
                                            <asp:TemplateField AccessibleHeaderText="pli" HeaderText="PLI">
                                                <ItemTemplate>
                                                    <asp:LinkButton ID="pli" runat="server" CausesValidation="False" CommandName="Select"
                                                        Text='<%# Eval("pli")%>'></asp:LinkButton>
                                                </ItemTemplate>
                                            </asp:TemplateField>
                                            <asp:BoundField DataField="versao" HeaderText="Versão" />
                                            <asp:BoundField DataField="totalAnoSafra" HeaderText="Total Ano Safra" />
                                            <asp:BoundField DataField="observacoes" HeaderText="Observações" />
                                            <asp:BoundField DataField="baseLine" HeaderText="BaseLine" SortExpression="baseLine" />
                                        </Columns>
                                        <SelectedRowStyle BackColor="#F6E6FF" ForeColor="#922980" Font-Bold="true" />
                                    </asp:GridView>
                                </div>
                                <div style="text-align: right; margin-removed 10px;">
                                    <asp:Button ID="btnVisualizar" runat="server" Text="Visualizar" CausesValidation="False"
                                        OnClick="btnVisualizar_Click" />
                                    <asp:Button ID="btnCancelar" runat="server" Text="Cancelar" CausesValidation="False" />
                                </div>
                            </div>
                        </div>
                    </asp:Panel>

                    <asp:ModalPopupExtender runat="server" ID="mpeHistoricoVersoes" TargetControlID="Label15" CancelControlID="btnCancelar" BehaviorID="BehaviorMpeHistoricoVersoes" 
                        PopupControlID="pnlHistoricoVersoes">
                    </asp:ModalPopupExtender>
                </ContentTemplate>
            </asp:UpdatePanel>

And Behind code:

protected void btnHistoricoVersoes_Click(object sender, EventArgs e)
{  
       mpeHistoricoVersoes.Show();
}