| Type: | Tree Item attribute |
| Description: | Specifies the mark state of a tree item. |
| Data Type: | integer |
| Default Value: | VAL_MARK_OFF |
Values
| VAL_MARK_OFF | The item's checkbox is unmarked. |
| VAL_MARK_ON | The item's checkbox is marked. |
| VAL_MARK_PARTIAL | The item's checkbox is partially marked (a dimmed mark). |