Admin TabularInline collapsed fieldset missing expand button

I need to display TabularInlines for multiple related tables and have
them all initially collapsed. I overrided admin/edit_line/tabular.html
and added the "collapsed" class to the <fieldset> element. This
collapses the fieldset alright, but there is no button/control to
expand it. I've googled for hours and see related posts but no
solution.

Thanks for any help.

Lee

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