Child Instance
class ChildInstance
A ChildInstance binds a parent's Child slot to a concrete child ControllerInstance in the tree. It is the instance-level half of the parent-child relationship and completes the type-level Child slot.
class ChildInstance
A ChildInstance binds a parent's Child slot to a concrete child ControllerInstance in the tree. It is the instance-level half of the parent-child relationship and completes the type-level Child slot.