1. Call parent.CreateOwned<ChildType>() to create the object on heap and add as parent's child;
2. When the child is expected to be killed, hide it, access all its properties, and call parent.Remove(..)

1. Call parent.CreateOwned<ChildType>() to create the object on heap and add as parent's child;
2. When the child is no longer needed, Detach it and remember the returned poiter.
3. Access its properties, and delete it manually.