What's the object ownership model?

When I create a control and add it to a hierarchy, apparently the parent control takes ownership of the child and ensures that it gets cleaned up properly.

If I create a window and show it with uiControlShow(), it seems that libui takes ownership of the window. Maybe because it's been reparented to the conceptual screen?

What happens then if I call uiControlHide()? Is the window deparented and therefore mine again, or does libui still keep it? What happens if I then show it once more?