whmcsDNSManager/modules/addons/DNSManager2/templates/admin/pages/settings/modal/include.tpl

<div class="modal fade">
    <div class="modal-dialog">
        <div class="modal-content">
            <div class="modal-header">
                <button type="button" class="close" data-dismiss="modal"><span aria-hidden="true">&times;</span><span class="sr-only">{$MGLANG->T('close')}</span></button>
                <h4 class="modal-title">{$MGLANG->T('include')}</h4>
            </div>
            <div class="modal-body">
                <form class="form-horizontal" role="form">
                    <input name="type" type="hidden" value="{$type}" />
                    <div class="form-group">
                        <label for="a1" class="col-sm-3 control-label">{$MGLANG->T('admins')}</label>
                        <div class="col-sm-9">
                            <select class="select2" id="a1" name="admins[]" multiple="">
                                {foreach from=$admins item="admin"}
                                    <option value="{$admin.id}" {if in_array($admin.id, $selected)}selected=""{/if}>{$admin.username} ({$admin.firstname} {$admin.lastname})</option>
                                {/foreach}
                            </select>
                        </div>
                    </div>
                </form>
            </div>
            <div class="modal-footer">
                <button type="button" class="btn btn-default" data-dismiss="modal">{$MGLANG->T('close')}</button>
                <button type="button" class="btn btn-primary btn-inverse" data-act="includeNotificationSave">{$MGLANG->T('save')}</button>
            </div>
        </div><!-- /.modal-content -->
    </div><!-- /.modal-dialog -->
</div><!-- /.modal -->