I've built an Open Atrium feature, and have been adding some tweaks to the .module. This includes a custom block that I'd like to have include some collapsed fieldsets. Normally, this would work:
However, it doesn't in the Ginkgo theme. The fieldset is indeed collapsible, but not collapsed initially. Oddly, when the legend is clicked, it appears to expand, as if it thought it was collapsed.
I'd very much appreciate some guidance as to how to implement a collapsed fieldset.