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https://issues.apache.org/jira/browse/FLEX-34202?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13956618#comment-13956618
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Gary Yang commented on FLEX-34202:
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This is a great improvement in data collection module.
> Add PropertyChangingEvent and CollectionChangingEvent so that developers can
> handle before change happens.
> ----------------------------------------------------------------------------------------------------------
>
> Key: FLEX-34202
> URL: https://issues.apache.org/jira/browse/FLEX-34202
> Project: Apache Flex
> Issue Type: Wish
> Components: Collections
> Reporter: Gary Yang
>
> The existing PropertyChangeEvent and CollectionEvent are working great, but
> they only dispatches after changed, it will be great if there can be events
> that let developers handle before change.
> Thanks.
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