OptionalDataArbitrary consumer data passed through with events.
OptionalDurationDuration in days. Used when EndDate is not provided.
OptionalEndEnd date for the bar. If omitted, Duration is used instead.
Unique identifier.
Display name shown in the grid and on the bar.
OptionalOpenWhether this item's children are expanded in the tree. Default: true.
OptionalParentParent item ID for tree hierarchy. Omit for top-level items.
OptionalProgressCompletion percentage (0–100). Rendered as a filled portion of the bar.
Start date for the bar.
A single item (bar) on the Gantt timeline.