Tree component example:
```jsx static
import React from 'react';
import { Tree } from 'polestar-ui-kit';

class MyComponent extends React.Component {

    render() {
        return (
            <Tree
                request={{
                    url: "http://192.168.232.211:9998/rest/resource/group",
                    chidrenUrl: (id) => `http://192.168.232.211:9998/rest/resource/${id}/children`,
                    method: "get",
                    itemsKey: "configuration"
                }}
                expandNodeLevel={2}
                header={true}
                expandAll={true}
                idKey="id"
                parentKey="parentId"
                labelKey="name"
                ondemand={true}
                collapseAll={true}
                dropdownButton={true}
            />
        );
    }
}

export default MyComponent;
```