text: import React from 'react';
  import DHeightTree from "../components/DHeightTree";
  import {treeData} from "./tree_data_json";
  
  function ManageTreeApp(props) {
    return (
      <div>
        <div style={{display:"flex"}}>
          <button>+</button>
          <button>-</button>
          <button>U</button>
        </div>
        <DHeightTree treeData={treeData}/>
      </div>
    );
  }
  
  export default ManageTreeApp;