| Tests ViewportDataGrid. | |
| Building tree. | |
| Attached aaa to aa | |
| Attached aab to aa | |
| Attached a to root | |
| Attached aa to a | |
| Attached ab to a | |
| Attached b to root | |
| Tree: | |
| a | |
| b | |
| Expanded node a | |
| Tree: | |
| a | |
| aa | |
| ab | |
| b | |
| Expanded node aa | |
| Tree: | |
| a | |
| aa | |
| aaa | |
| aab | |
| ab | |
| b | |
| Collapsed node a | |
| Tree: | |
| a | |
| b | |