[feature-request] Please add new GUI container element, that shows/hides others, "QIArrowButtonSwitch"

Hi,

I'm python/pyQt4 developer, and came across very useful Qt element/widget, that isn't included in standard Qt4.

It's called "QIArrowButtonSwitch", and it is a container element, that can show/hide various extra settings, and would be very useful in lots of Qt applications. (Screenshot attached)

Including it into main Qt library will allow it's use by Java/Python developers, as well as correct view by Qt Designer, and will make Qt applications easier to use.

It turns out, this is a custom Qt4 element made by "VirtualBox" developers. www.virtualbox.org – look for QIArrowButtonSwitch.cpp and UIMachineSettingsNetwork.ui

Please evaluate possible inclusion of "QIArrowButtonSwitch" into Qt lib+Qt Designer.

Thanks in advance,
-Technologov, 21.Jun.2011.