symfony/symfony — pull request #3768 by Burgov (2012-04-03 19:18:09+00:00)
Title: [Form] added ChildDataEvent

Bug fix: no
Feature addition: yes
Backwards compatibility break: no
Symfony2 tests pass: yes
Fixes the following tickets: #3767

This new event is fired every time a forms child is bound, allowing listeners to add or remove field accordingly, based on the appData of the child form. See the ticket mentioned above for a use case scenario