| Description | |
|---|---|
| item | Item to add. | 
| parentId | The parent id for the item. | 
| childIndex | The child index in the parent's children list. | 
| rebuildTree | Whether the tree data should be rebuilt right away. Call <see cref="TreeViewController.RebuildTree()" /> when <c>false</c>. | 
Adds an item to the tree.