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You may have this in other code somewhere but as of right now from what we see. public var assumptionsDGData:ArrayCollection; is declaring the variable that it's an ArrayCollection however it's not creating a new instance of ArrayCollection. So if your initHandler() fires before the ArrayCollection has been created your event listener won't listen properly. Try doing [Bindable]
public var assumptionsDGData:ArrayCollection = new ArrayCollection();
hhhhhmmmmm. Unfortunately thats not working me. I've found a workaround to my problem so this one is not a huge priority. The workaround isn't great however so if there is another solution I'd be interested in knowing about it. Thank you for your help so far though
Heres a test example I write that implements a listener on CollectionChange event. Maybe this will help you out.