
When the parent document becomes composited, the layer trees should get connected together.

(GraphicsLayer
  (bounds 800.00 600.00)
  (children 1
    (GraphicsLayer
      (bounds 800.00 600.00)
      (contentsOpaque 1)
      (children 2
        (GraphicsLayer
          (position 0.00 100.00)
          (bounds 386.00 236.00)
          (drawsContent 1)
          (children 1
            (GraphicsLayer
              (position 43.00 43.00)
              (children 1
                (GraphicsLayer
                  (bounds 285.00 150.00)
                  (children 1
                    (GraphicsLayer
                      (children 1
                        (GraphicsLayer
                          (bounds 285.00 230.00)
                          (children 1
                            (GraphicsLayer
                              (bounds 285.00 230.00)
                              (drawsContent 1)
                              (children 1
                                (GraphicsLayer
                                  (position 18.00 10.00)
                                  (bounds 210.00 210.00)
                                  (contentsOpaque 1)
                                )
                              )
                            )
                          )
                        )
                      )
                    )
                  )
                )
              )
            )
          )
        )
        (GraphicsLayer
          (position 8.00 8.00)
          (bounds 100.00 100.00)
          (contentsOpaque 1)
        )
      )
    )
  )
)