TreeLine Constants
| Constant | Value | Description |
| tvwTreeLines | 0 | Treelines shown |
| tvwRootLines | 1 | Rootlines shown with Treelines |
TreeRelationship Constants
| Constant | Value | Description |
| tvwFirst | 0 | First Sibling |
| tvwLast | 1 | Last Sibling |
| tvwNext | 2 | Next sibling |
| tvwPrevious | 3 | Previous sibling |
| tvwChild | 4 | Child |
TreeStyle Constants
| Constant | Value | Description |
| tvwTextOnly | 0 | Text only |
| tvwPictureText | 1 | Picture and text |
| tvwPlusMinusText | 2 | Plus/minus and text |
| tvwPlusPictureText | 3 | Plus/minus, picture, and text |
| tvwTreelinesText | 4 | Treelines and text |
| tvwTreelinesPictureText | 5 | Treelines, Picture, and Text |
| tvwTreelinesPlusMinusText | 6 | Treelines, Plus/Minus, and Text |
| tvwTreelinesPlusMinusPictureText | 7 | Treelines, Plus/Minus, Picture, and Text |
LabelEdit Constants
| Constant | Value | Description |
| tvwAutomatic | 0 | Label Editing is automatic |
| tvwManual | 1 | Label Editing must be invoked |