From the Qt blog: Widgets on a header
Andy Shaw of Digia just posted a nice blog article on how to use widgets in a header view. The example places combo boxes onto each section. It can easily be adapted to provide a checkbox or something similar.
Read the full blog post here: http://blog.qt.digia.com/2012/09/28/qt-support-weekly-27-widgets-on-a-header/
Nice one, thank you, Volker.