woothemes/woocommerce — pull request #814 by GeertDD (2012-03-15 13:24:12+00:00)
Title: Smarter toggling of the metabox for variations

The metabox h3 rows for variations contain select lists. When you click a select list, the event bubbles up to the h3 meaning that both the select list will expand as well as the box. You are basically triggering two things while you only wanted to interact with the select list.