Use Custom Display for Qt Objects

http://doc.qtsoftware.com/qtcreator-1.2/creator-debugging.html

The documentation mentions:

The Locals and Watchers view also provides access to the most powerful feature of the debugger: comprehensive display of data belonging to Qt's basic objects. To enable this feature, select Use Custom Display for Qt Objects from the Debug menu.The Locals and Watchers view will be re-organized to provide a high-level view of the objects. For example, in case of QObject, instead of displaying a pointer to some private data structure, you will see a list of children, signals and slots.

while it probably means:

Options -> Debugger -> Debugging Helper