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If you walk the parent chain from the borderskin you can see who's parent it
If you look at why it is calling invalidateProperties it may become apparent
as to how to stop the loop.
When looking at the parent.parent .. I've saw that the object causing this endless Loop is ToggleButtonBar.
I couldn't find why it's causing these calls to invalidate, but by replacing this component (which is deprecated) by spark:ButtonBar the problem was solved.
Do you have any idea why would this happen?
And why the exact same code worked fine in the beta, and stopped working after moving to the new version?
There were lots of changes after beta so it probably isn't worth finding out
what changed if you have a solution that works.