```ts
// ButtonGroup.stories.ts

import { moduleMetadata } from '@storybook/angular';
import { CommonModule } from '@angular/common';

import ButtonGroup from './ButtonGroup.component';
import Button from './button.component';
import * as ButtonStories from './Button.stories';

export default {
  title: 'ButtonGroup',
  component: ButtonGroup,
  decorators: [
    moduleMetadata({
      declarations: [Button],
      imports: [CommonModule],
    }),
  ],
};

const Template = (args: ButtonGroup) => ({
  component :ButtonGroup,
  props: args,
});

export const Pair = Template.bind({});
Pair.args = {
  buttons: [ ...ButtonStories.Primary.args, ...ButtonStories.Secondary.args ],
  orientation: 'horizontal',
};
```