TreeView (kendo ui for react)-expand all nodes by default

Hi,

can anyone help with this problem?

https://www.telerik.com/kendo-react-ui/components/treeview/expansion/expanding-all/

I need to expand all items by default  in treeview, but it does not work for nested hierarchy. I tried this example, but it does not work for nested json.

For example if i have sometnig like this, it does not show element 'a'?

const tree = [{
  text: 'Item1',
  items: [{
    text: 'Item1.1'
  }, {
    text: 'Item1.2',
    items:[{text:'Item a'}]
  }]
}, {
  text: 'Item2',
  items: [{
    text: 'Item2.1'
  }, {
    text: 'Item2.2'
  }]
}];