Functions
| child(...) | Gets the child node at the specified index. |
| children( ) | Gets the children of the group. |
| clear( ) | Removes all children from the group. |
| insert(...) | Inserts a node into the group at the specified index. |
| push(...) | Inserts a node as the last child of the group. |
| remove(...) | Removes a node from the group. |