ModifyButtonBarEvent 

Example 

Registration of the event listener in the extension's Services.yaml:

services:
  # Place here the default dependency injection configuration

  MyVendor\MyExtension\Backend\EventListener\MyEventListener:
    tags:
      - name: event.listener
        identifier: 'my-extension/backend/modify-button-bar'

Read how to configure dependency injection in extensions.

The corresponding event listener class:

<?php

declare(strict_types=1);

namespace MyVendor\MyExtension\Backend\EventListener;

use TYPO3\CMS\Backend\Template\Components\ModifyButtonBarEvent;

final class MyEventListener
{
    public function __invoke(ModifyButtonBarEvent $event): void
    {
        // Do your magic here
    }
}

API 

class ModifyButtonBarEvent

Fully qualified name

\TYPO3\CMS\Backend\Template\Components\ModifyButtonBarEvent

Listeners can modify the buttons of the button bar in the backend module docheader

getButtons ( )

Returns

array

setButtons ( array $buttons)

param $buttons

the buttons

getButtonBar ( )

Returns

TYPO3CMSBackendTemplateComponentsButtonBar