Loads hierarchical data.
| loadBranch | loads data to the specified branch, as direct children of the node with the ID provided |
| onAfterAdd | fires after adding an item to the datastore |
| onAfterDelete | fires after an item is removed |
| onAfterSort | fires after sorting dataset |
| onBeforeAdd | fires before adding an item to the datastore |
| onBeforeDelete | fires before an item is removed |
| onBeforeSort | fires before sorting of the dataset |
| onDataRequest | fires when dynamically-loaded data is requested |
| onDataUpdate | fires when a data item is being updated |
| filterMode | defines the pattern for tree item filtering |