code/models/editablefields/EditableFieldMultipleOption.php
public function getFieldConfiguration()
    {
        if (!$this->isInDB()) {
            $field = LiteralField::create('Options', '<p class="message notice">Once you save this field you will be able to add options</p>');
        } else {
            $config = GridFieldConfig_RelationEditor::create()
                ->addComponent(new GridFieldOrderableRows('Sort'));

            $config
                ->getComponentByType('GridFieldDataColumns')
                ->setDisplayFields([
                    'Name'    => 'Name',
                    'Title'   => 'Title',
                    'Default' => 'Default',
                ])
                ->setFieldFormatting([
                    'Default' => function ($_, Moo_EditableFieldOption $option) {
                        return $option->Default ? 'Yes' : 'No';
                    },
                ]);
            $field = GridField::create('Options', 'Options', $this->Options(), $config);
        }

        return [
            $field,
        ];
    }
public function getFieldConfiguration()
    {
        if (!$this->isInDB()) {
            $field = LiteralField::create('Options', '<p class="message notice">Once you save this field you will be able to add options</p>');
        } else {
            $config = GridFieldConfig_RelationEditor::create()
                ->addComponent(new GridFieldOrderableRows('Sort'));

            $config
                ->getComponentByType('GridFieldDataColumns')
                ->setDisplayFields([
                    'Name'    => 'Name',
                    'Title'   => 'Title',
                    'Default' => 'Default',
                ])
                ->setFieldFormatting([
                    'Default' => function ($_, Moo_EditableFieldOption $option) {
                        return $option->Default ? 'Yes' : 'No';
                    },
                ]);
            $field = GridField::create('Options', 'Options', $this->Options(), $config);
        }

        return [
            $field,
        ];
    }
Get extra configuration fields.

@return array