content: 
  import React from 'react';
  import PropTypes from 'prop-types';
  import Ok from 'material-ui-icons/Done';
  
  const isDirectCell = (props) => {
    const { isDirect } = props;
    return (isDirect ? <Ok /> : <div>-</div>);
  };
  
  isDirectCell.propTypes = {
    isDirect: PropTypes.bool,
  };
  
  export default isDirectCell;
  