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I have a productCard where the addToCart button is pressed, a shoppingCart modal that pops up once that has happened, and the App Component that renders it all. I'm having a hard time passing the click event from the addToCart button (in the productCard Comp) to trigger the handleShow() method in the (shoppingCart comp). Here's my code:

shoppingCart.js:

import React from "react";
import 
 Popover,
 Tooltip,
 Button,
 Modal,
 OverlayTrigger
 from "react-bootstrap";
// import ProductCard from "./productCard.js";
import "./shoppingCart";

export class ShoppingCart extends React.Component 
 constructor(props) 
 super(props);

 this.handleShow = this.handleShow.bind(this);
 this.handleClose = this.handleClose.bind(this);

 this.state = 
 show: false
 ;
 

 handleClose() 
 this.setState( show: false );
 

 //I'm trying to trigger this method from the onClick event in 
 //productCard.js

 handleShow() 
 this.setState( show: true );
 

 render() 
 return (
 <div>

 <Modal show=this.state.show onHide=this.handleClose>
 <Modal.Header closeButton>
 <Modal.Title>Your Cart</Modal.Title>
 </Modal.Header>
 <Modal.Body>
 <p>Current Items: </p>
 </Modal.Body>
 <Modal.Footer>
 <Button onClick=this.handleClose>Continue Shopping</Button>
 <Button>Checkout</Button>
 </Modal.Footer>
 </Modal>
 </div>
 );
 

productCard.js

import React from "react";
import Grid, Row, Col, Thumbnail, Button from "react-bootstrap";
import ShoppingCart from "./shoppingCart.js";
import "./productCard.css";

export class ProductCard extends React.Component 
 constructor(props) 
 super(props);
 

 render() 
 return (
 <div className="ProductCard">
 <Grid className="Grid">
 <Row>
 <Col xs=12 sm=6 md=3>
 <Thumbnail
 className="Thumbnail"
 src="http://placehold.jp/300x200.png"
 alt="300x200"
 >
 <h3>Product Name</h3>
 <p>Description</p>
 <p>
 <Button bsStyle="primary">Read More</Button>
 &nbsp;
 <Button bsStyle="success" onClick=this.props.handleShow>Add to Cart</Button>
 </p>
 </Thumbnail>
 </Col>
 </Row>
 </Grid>
 </div>
 );
 

I'm sure it's a simple misunderstanding, but I'm having trouble wrapping my head around this and it's held me up for long enough. Thanks for any help!