Modal dialogs missing window manipulation buttons(close, minimize, maximize) on mac

When you create a modal dialog now, there aren't any buttons on the top bar to manipulate the window so you have to provide your own cancel button in order for the window to be closable.

This is particularly bad for QWizard as there is no built in cancel button so you have to add one to every page or subclass and modify QWizard itself for it to be usable.