Add a new button inside a Gridfield individual item for Silverstripe

gistfile1.txt

// Create an  extension attached to: SilverStripe\Forms\GridField\GridFieldDetailForm_ItemRequest

class GridFieldDetailFormItemRequestExtension extends Extension
{

    public function updateFormActions(FieldList $actions)
    {
        $record = $this->owner->getRecord();
        // This extension would run on every GridFieldDetailForm, so ensure you ignore contexts where
        // you are managing a DataObject you don't care about
        if ((!$record instanceof FOO || !$record->exists()) {
            return;
        }
        
        if ($record instanceof FOO) {
            $actions->insertBefore(
                FormAction::create('doYourAwesomeAction', 'Awesome Action')
                    ->setUseButtonTag(true)
                    ->addExtraClass('btn action btn-info font-icon-p-news-item'),
                'action_doDelete'
            );
        }
    }

    public function doYourAwesomeAction($data, $form)
    {
        // whatever your button needs to do
    }
}

It would be good to see what you need to return in the action.

Great example also!!! love it.