How to get object of specific page in Grav plugin - plugins

Question

I've tried a lot of ways, but without success
For example
use Grav\Common\Page\Pages;
public function onPagesInitialized()
{
$pages = $this->grav['pages'];
print_r($pages->get('/about'));
// or
print_r($pages->find('/about', true));
}
returns nothing
The plugin of flex objects is enabled
EDITED
Adding the function onPluginsInitialized() with enabling onPagesInitialized() also doesn't help:
public function onPluginsInitialized(): void
{
$this->enable([
'onPagesInitialized' => ['onPagesInitialized', 0],
]);
}

Answer 1

The following is a sample of how one can get a specific page object.
When using the following folder structure: (from Blog skeleton)
user/pages
└── 01.blog
   ├── blog.md
   ├── ...
   ├── hero-classes
   │   ├── item.md
   │   └── unsplash-overcast-mountains.jpg
   ├── london-at-night
   │   ├── item.md
  │   ├── unsplash-london-night.jpg
   │   └── unsplash-xbrunel-johnson.jpg
└── ...
Assuming event 'onPagesInitialized' has been subscribed to, the following code correctly returns the sought pages:
public function onPagesInitialized(Event $event) {
/** #var Pages */
$pages = $event['pages']; // or $this->grav['pages'];
$p1 = $pages->find('/blog');
$p2 = $pages->find('/blog/london-at-night');
$p3 = $pages->find('/blog/hero-classes');
}
Note:
When the request is made by plugin Admin, pages will not be initialized. One needs to call $this->grav['admin']->enablePages(); first.
public function onPagesInitialized(Event $event) {
$this->grav['admin']->enablePages();
/** #var Pages */
$pages = $event['pages']; // or $this->grav['pages'];
$p1 = $pages->find('/blog');
$p2 = $pages->find('/blog/london-at-night');
$p3 = $pages->find('/blog/hero-classes');
}