Tab Positions QDockWidgets Show/Hide not remembered!

I'm trying to make a QDockWidget area that rolls in and out when the user mouse-overs (see the start of this video http://www.youtube.com/watch?v=8tAASvcrJ78 ). To do that I'm getting all the dock widgets from the window by window.findChildren<QDockWidget*>() and then doing w.setVisible(false) on all of them.

Problem is that it has bugs. If you download, build and run the C++ example (qmake/make), then Qt selects the tab position selected before the current one, and then reselects the last one again and so forth.

This is compounded by not being able to see which QTabBar is associated with which dock widgets, meaning I cannot force the active tab to be restored manually (since I don't know whether the QTabBar belongs to the widget or something else)