Show subgroups in article list

  <z:prepare alias="subgroup" dataclass="maingroup" scope="page" sortorder="{group.sortorder} asc, {group.name} asc" ParentNumber=$z:get[request.gid]>
    <z:if $z:iteration[subgroup.count] gt 0>
        <z:foreach alias="subgroup" maxrows=200>
            <div class="col-12 col-sm-6 col-md-4 col-lg-3 mb-3">
                <div class="thumbnail">
                    <a href="<z:url gid=$z:value[subgroup.number]>" alt="<z:esc mode=html value=$z:value[subgroup.name]>" title="<z:esc mode=html value=$z:value[subgroup.name]>">
                        <z:set scope="page" name="subgroupimg">group-$z:value[subgroup.number]</z:set>
                        <z:include control=$z:plugin[imageupload.image] Picture=$z:get[page.subgroupimg] Path="ErpImages/fff/{0}/{1}" width=400 height=240 alt=$z:value[subgroup.name]>
                    </a>
                    <div class="caption pb-3">
                        <h4 class="text-overflow text-center">
                            <a href="<z:url gid=$z:value[subgroup.number]>">
                            <z:esc mode="html" value=$z:value[subgroup.name]>
                            </a>
                        </h4>
                    </div>
                </div>
            </div>
        </z:foreach>
    </z:if>