First, please note that since Paul Mooney and Warren Elsemore gave me the official English dictionary, I have been trying to be sensitive to the spelling needs of the non-Americans, and have been using the letter "u" more often in my blog posts.
Now to me real question: In a response to this post about the sidebar, Randy Castle said that clicking on of the little "minimized on the bottom" icons made all of the little titlebars appear. Here is Jamie's response (she's the developer who worked hard to bring you this feature!)
The only time that would occur is if you have 2 icons remaining in the iconbar. I programmatically made it such that you would never have only one icon in the iconbar since the iconbar would be taking up as much room as a titlebar**. So, whenever the user removes the 2nd to last panel from the iconbar (either by pressing an icon or via drag), both icons come out of the iconbar, but the last one remains collapsed. I also did this because I thought it would be consistent with dragging things into the iconbar...when dragging, you can never just drag one panel into the iconbar (initially, that is...before the iconbar has any items in it).
** the one exception to this is if a person uses the Minimize to Icon menu item and the iconbar doesn't have any items. Since it would not make sense to add two things to the iconbar at this point, only one panel will get added.
For example, the 2 pictures below are trying to illustrate that I have 2 icons in the icon bar at the bottom. I click the My Widgets icon, and that opens the My Widgets panel and simultaneously changes the bottom icon bar to the titlebar for the "Day at a Glance" because the titlebar and the icon bar take up the same amount of space so we may as well give you the greater flexibility of the titlebar.
But, maybe we were being too smart for our own good. So play with your 8.5 beta a bit, tell us what you think. We still have a small window of opportunity to change the behaviour.