The popular items menu on www.nfpn.org (displayed in right side bar) has sub-menu items defined. When someone navigates to a top-level page that's represented in that menu, I'd like for the child items to be displayed. I've played with various mod_mainmenu settings for that menu (in the modules section) without success.
How would I get the appropriate sub-menu to expand?
I'm using Joomla 1.5.21.