The changes here are mostly fixing some sizing issues.
For the FlashContainerPlaceholder, the first child is now MyFlexContentHolder, which extends mx.flash.FlexContentHolder but meets the invariant that it has 1 child and that child is FlexContentHolderThumbnail, which I?\226?\128?\153ve added as a swc to the project. I changed this by accident last time to refer to mx.flash.FlexContentHolder, when it should've referred to a concrete instance created by Flash from a swc. I also added a chrome of 151x151 to match the FlexContentHolderThumbnail since otherwise the container itself would have no chrome at all, and this let?\226?\128?\153s it size correctly.
Also, for sizing, in a container, rather than sizing to the size of the chrome, I now size to the size of the FlexContentHolder thumbnail that all FlexContentHolder?\226?\128?\153s have. This means in ContainerMovieClip, I don?\226?\128?\153t need to override bounds anymore.
ContainerMovieClip now implements IVisualElementContainer.
Also, I fixed a resizing event bug in UIMovieClip where the resize event was getting dispatched more than once.