Angular Material mat-tree with checkboxes select all

I'm using Tree with checkboxes, and I want to add a button to check all checkboxes, I tried different methods but no good, the best thing i was able to achieve is this:

  selectAllFiscal() {
    this.rootItems.forEach(node => {
      this.todoItemSelectionToggle(node);
    });
  }

rootItems is an array of root nodes.

I can see that nodes are selected when I iterate checklistSelection.selected, but the checkboxes are not selected in the browser, can anybody point the problem, thanks.