harvesthq/chosen — pull request #601 by malixsys (2012-04-30 15:27:52+00:00)
Title: Added events (liszt:hiding_dropdown, liszt:showing_dropdown) 

to dropdown hiding/showing to support custom event scenarios and inextricable z-index problems

see:
https://github.com/malixsys/chosen/commit/8f8eca3e1f304d3cfd2b5e0b454646bc0ddcff1c
https://github.com/harvesthq/chosen/pull/598#issuecomment-5407057
https://github.com/harvesthq/chosen/pull/598