show sidebar based on customfield

[Danse]

Hi, 

can someone help me with just a simple Text Sidebar. 

I need a Hook which inserts a Sidebar to Client Area if i hit a Checkbox in Backend within Client. 

(Checkbox from Customfields) 

 

<?php
 
use WHMCS\View\Menu\Item as MenuItem;
 
// Add Sidebar Panel if Customer didn't signed Document.
add_hook('ClientAreaSecondarySidebar', 1, function (MenuItem $secondarySidebar)
{
    // IF Customfield is AKTIV then Hide, otherwise show following Sidebar. 
    $client_custom_filed_name = 'av-checkbox';
    $clientid = $clientobj->userid;

    // Get Client Details
    $clientdata = Capsule::table('tblcustomfieldsvalues')
    ->select('value')
    ->join('tblcustomfields', 'tblcustomfields.id', '=', 'tblcustomfieldsvalues.fieldid')
    ->where('tblcustomfields.fieldname', '=', $client_custom_filed_name)
    ->where('tblcustomfields.type', '=', 'client')
    ->where('tblcustomfieldsvalues.relid', '=', $clientid)
    ->first();

    if ($clientdata->value == 'off') {
        
    
    // Add a panel to secondary sidebar
    $secondarySidebar->addChild('av-contract', array(
        'label' => 'CustomTitel',
        'uri' => '#',
        'icon' => 'fa-file-contract',
     ))
 
    // Retrieve the panel
    $customPanel = $secondarySidebar->getChild('av-contract');


    // Add a Link
    $customPanel->addChild('av-link', array(
        'label' => 'Linkname',
        'uri' => '',
        'icon' => 'fa-file-contract',
    ));

    }
});

Any Idea?