"Add container" is missing

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Can anyone tell me how C5 decides when to show "Add container" for a particular theme (Both cloneamental and elemental, in this case)?

I do have enableGridContainer() set for the areas in question.

<?php 
$a = new Area('Main');
$a->enableGridContainer();
$a->display($c);
?>


Plus, the page_theme.php file contains

protected $pThemeGridFrameworkHandle = 'bootstrap3';

Conkreet
 
Conkreet replied on at Permalink Reply
Conkreet
Never mind. I think this is a problem with the White-Label addon. Will report, later, when I know the full story.