How to use the react-overlays.Modal function in react-overlays

define(function (require) {

    var React = require('react');
    var Modal = require('react-overlays').Modal;
    require('./Overlay.less');

    class Overlay extends React.Component {
        constructor(props) {
            super(props);

            this.state = {
                show: props.show,
                items: props.items,
            };
        }

        close() {
            this.setState({ show: false });
        }