| Name | Description | |
|---|---|---|
 | collapse | Collapses current group. |
| expand | Expands current group. |
| getEndIndex | Gets the end index of current group. |
| getIsCollapsed | Get whether the current group is collapsed |
| getLevel | Gets the level of current group. |
| getParent | Get the parent of current group |
| getStartIndex | Gets the start index of current group. |