Ths is a regression from my checkin yesterday. If the mxmlContent hasn't been validated yet and something gets added in the interrim, we should just add it anywhere on the display list.
This isn't an optimal fix as if th mxmlContent is invalid, we probably don't need to do anything here. I'll make this optimization later.
QE Notes: We should add tests to make sure we test all these methods before proper initialization
Doc Notes: None
tests: checkintests, mustella Group tests