Please try the following code:

 

<asp:Button ID="cmdUploadFiles" runat="server" meta:resourcekey="cmdUploadFiles"></asp:Button>
                        <sc:ModalForm ID="modalFormUploadFiles" runat="server" Width="300px"                             
                            ActivateControlId="cmdUploadFiles"
                            CancelControlID="cmdUploadFilesCancel"
                            CloseImage="ModalClose.gif" CloseRolloverImage="ModalCloseRO.gif">                        
                        <table>
                            <tr>                                
                                <CuteWebUI:UploadAttachments runat="server" ID="uploadMultipleFiles"
                                    MultipleFilesUpload="true" ManualStartUpload="true"  ShowCheckBoxes="false">                                       
                                    <InsertButtonStyle />
                                    <ValidateOption AllowedFileExtensions="bib" MaxSizeKB="10000" />
                                </CuteWebUI:UploadAttachments>
                            </tr>
                            <tr>
                                <asp:LinkButton ID="cmdUploadFilesOk" runat="server" meta:resourcekey="cmdOk"></asp:LinkButton>
                                <asp:LinkButton ID="cmdUploadFilesCancel" runat="server" meta:resourcekey="cmdCancel"></asp:LinkButton>    
                            </tr>
                        </table>
                        </sc:ModalForm> 

 

Regards,

Eric