CheckboxGroup with indeterminate/select all checkbox

^{Originally posted by **richbachman** October 6, 2023}
Hi team. First off, great work on the react-aria-components work. I'm really enjoying seeing it grow. I'm working on using the Checkbox and CheckboxGroup components, and am struggling with coming up with a way to have a select all option with an indeterminate state. Here's what I have so far, but something just isn't clicking. I didn't see an example on the doc site, but do you have one worked up somewhere else?

Thanks in advance.

```
const CheckboxGroupExample = () => {
const [selected, setSelected] = React.useState(["subscribe", "test"]);

const allSelected = selected.length === 3;
const indeterminate =
selected.length < 3 && selected.length > 0 && !allSelected;

return (
<>


Select all


Subscribe


Test


Another

{selected}