- item1 with key and tooltip
- item2
- Folder with some children
- Sub-item 3.1
- Sub-item 3.1.1
- Sub-item 3.1.2
- Sub-item 3.2
- Sub-item 3.2.1
- Sub-item 3.2.2
- Document with some children (expanded on init)
- Sub-item 4.1 (active and focus on init)
- Sub-item 4.1.1
- Sub-item 4.1.2
- Sub-item 4.2
- Sub-item 4.2.1
- Sub-item 4.2.2