vtiger view actions with dropdown options - childLinks

DetailView-partial.php

$link = [
      'linktype' => 'DETAILVIEWBASIC',
      'linklabel' => vtranslate( 'Parent Button Label' )
];
$link = Vtiger_Link_Model::getInstanceFromValues( $link );
$link->addChildLink( Vtiger_Link_Model::getInstanceFromValues( [ 
  'linklabel' => vtranslate( 'Child Link Label' ), 
  'linkurl' => '?url_to_go_to' 
] ) );

DetailViewActions-partial.tpl

{foreach item=DETAIL_VIEW_BASIC_LINK from=$DETAILVIEW_LINKS['DETAILVIEWBASIC']}
    {assign var=childLinks value=$DETAIL_VIEW_BASIC_LINK->getChildLinks()}
    {assign var=dropbox value=($childLinks|@count gt 0)}
    {if !$dropbox}
    <button class="btn btn-default" id="{$MODULE_NAME}_detailView_basicAction_{Vtiger_Util_Helper::replaceSpaceWithUnderScores($DETAIL_VIEW_BASIC_LINK->getLabel())}"
            {if $DETAIL_VIEW_BASIC_LINK->isPageLoadLink()}
                onclick="window.location.href = '{$DETAIL_VIEW_BASIC_LINK->getUrl()}&app={$SELECTED_MENU_CATEGORY}'"
            {else}
                onclick="{$DETAIL_VIEW_BASIC_LINK->getUrl()}"
            {/if}
            {if $MODULE_NAME eq 'Documents' && $DETAIL_VIEW_BASIC_LINK->getLabel() eq 'LBL_VIEW_FILE'}
                data-filelocationtype="{$DETAIL_VIEW_BASIC_LINK->get('filelocationtype')}" data-filename="{$DETAIL_VIEW_BASIC_LINK->get('filename')}"
            {/if}>
        {vtranslate($DETAIL_VIEW_BASIC_LINK->getLabel(), $MODULE_NAME)}
    </button>
    {else}<span>
    <button class="btn btn-default dropdown-toggle" data-toggle="dropdown" href="javascript:void(0);">
       {vtranslate($DETAIL_VIEW_BASIC_LINK->getLabel(), $MODULE_NAME)}&nbsp;&nbsp;<i class="caret"></i>
    </button>
        <ul class="dropdown-menu dropdown-menu-right">
            {foreach item=DETAIL_VIEW_LINK from=$childLinks}
            {if $DETAIL_VIEW_LINK->getLabel() eq ""}
                <li class="divider"></li>
                {else}
                <li id="{$MODULE_NAME}_detailView_moreAction_{Vtiger_Util_Helper::replaceSpaceWithUnderScores($DETAIL_VIEW_LINK->getLabel())}">
                    {if $DETAIL_VIEW_LINK->getUrl()|strstr:"javascript"}
                        <a href='{$DETAIL_VIEW_LINK->getUrl()}'>{vtranslate($DETAIL_VIEW_LINK->getLabel(), $MODULE_NAME)}</a>
                    {else}
                        <a href='{$DETAIL_VIEW_LINK->getUrl()}&app={$SELECTED_MENU_CATEGORY}' >{vtranslate($DETAIL_VIEW_LINK->getLabel(), $MODULE_NAME)}</a>
                    {/if}
                </li>
            {/if}
        {/foreach}
            </ul>
    </span>
    {/if}
{/foreach}