Tree view

      <div style={{width: '300px'}}>
        <TreeView label="Tree View">
          <TreeNode
            key='1'
            id='1'
            value='Artificial intelligence'
            label={<span>Artificial intelligence</span>}
          />
          <TreeNode
            key='2'
            id='2'
            value='Blockchain'
            label='Blockchain'
          />
          <TreeNode
            key='3'
            id='3'
            value='Business automation'
            label='Business automation'
          >
            <TreeNode
              key='3-1'
              id='3-1'
              value='Business process automation'
              label='Business process automation'
            />
            <TreeNode
              key='3-2'
              id=