function ShowLoginWindow() {
            pcImport.Show();
        }
<input type="button" value="导入" onclick="ShowLoginWindow()" class="but_a" style="width:50px"/>
<dx:ASPxPopupControl ID="pcImport" runat="server" ClientInstanceName="pcImport" Width="100px" Height="50px"
             CloseAction="CloseButton" Modal="True" PopupHorizontalAlign="WindowCenter" PopupVerticalAlign="WindowCenter" HeaderText="Import"
            AllowDragging="True" EnableAnimation="False" EnableViewState="False">
            <ContentCollection>
                <dx:PopupControlContentControl>
                    <asp:FileUpload ID="fuData" runat="server" />
                    <asp:Button ID="lbImport" runat="server" OnClick="lbImport_Click" Text="确定" />
                </dx:PopupControlContentControl>
            </ContentCollection>
        </dx:ASPxPopupControl>
运行后报错
错误: 对象不支持“createEvent”属性或方法导入成功之后,点击ASPxPopupControl控件自带的关闭按钮时报错