Tabs in custom implementation of grocery crud

Question

I am using grocery crud (GC) with a custom php code (not for CI). I want data in tabs in edit page. I have found this "GC CRUD Tabs" extension for CI but I don't know how to have (integrate) that functionality for custom php implementations.

i tried

$crud->fields(['tabs','dbname','dbpass','dbserver']);
$tabs = array ( 
array('Test Tab','dbname','dbpass')
,array('Test tab2','dbserver')  
); 
$crud->callbackEditField('tabs', function ($tabs, $primaryKeyValue)
{
print_r($tabs);
});

But it failed with error "cannot read property 'isReadOnly' of undefined" as "tabs" is a fake field.(to be changed to original tabs on callback).