## Mixing hierarchical and flattened stacking

You can use the `descriptionGroup` option to combine hierarchical and stacked flattening in one diagram. This example uses hierarchical layout for top-level groups and flattens lower-level groups.

Since setting per-group stacking is not yet supported, to implement flattened stacking inside a hierarchical layout a small trick is required: all groups on the second level have their `open` and `description` properties set to `true`. This will visually emulate flattened stacking while the global stacking option remains set to `hierarchical`.