` — Function to be called when the color mode toggle button is clicked. If specified, a color mode toggle button will be shown.
- `extraItems`: `Array<{text: string, icon: React.ReactNode, onClick: Function}>` — Additional menu items to display.
## Example
```tsx
'use client';
import { UserButton } from '@stackframe/stack';
export default function Page() {
return (
User Button
{
console.log('color mode toggle clicked');
}}
extraItems={[
{
text: 'Custom Action',
icon: ,
onClick: () => console.log('Custom action clicked'),
},
]}
/>
);
}
```