[FRigElementKey](API\Plugins\ControlRig\Rigs\FRigElementKey) AddReference ( [FName](API\Runtime\Core\UObject\FName) InName, [FRigElementKey](API\Plugins\ControlRig\Rigs\FRigElementKey) InParent, [FRigReferenceGetWorldTransformDelegate](API\Plugins\ControlRig\Rigs\FRigReferenceGetWorldTransformDe-) InDelegate, bool bSetupUndo )