let btn = {
  value: 'Dropdown Button',
  iconClass: 'more'
};
let items = [{
  items: [{
    title: 'Change Security Group',
    key: '0'
  }, {
    title: 'Change Passoword',
    key: '1'
  }]
}, {  
  title: 'Volume Ops',
  key: 'volume',
  items: [{
    title: 'Termitate',
    key: '2',
    danger: true
  }, {
    title: 'Remove Volume',
    key: '3',
    disabled: true
  }]
}];

ReactDOM.render(
  <DropdownButton
    buttonData={btn}
    dropdownItems={dropdownItems}
    dropdownOnClick={listener}
    dropdownStyle=
  />,
  document
);