import TreeMenu from 'react-simple-tree-menu';
import { Menu, Item, Separator, Submenu, MenuProvider } from 'react-contexify';

<div style={{  zIndex: '-1' }}>
  <MenuProvider id="menu_idTree" style={{  display: 'inline-block', zIndex: '-1' }}>
  <TreeMenu style={{  zIndex: '-1' }} data={treeData}  onClickItem={({ key, label, ...props }) => {
      alert("Clicked "+label)
    }} hasSearch="false"/>
  </MenuProvider>
  </div>
<ContextMenuTree />
</div>