gtk:settings-gtk-dialogs-use-header (object)

object -- a gtk:settings object
setting -- a boolean whether dialogs use a header bar

The accessor for the gtk-dialogs-use-header slot gets or sets whether built-in GTK dialogs such as the file chooser, the color chooser or the font chooser will use a header bar at the top to show action widgets, or an action area at the bottom. This setting does not affect custom dialogs using the gtk:dialog widget directly, or message dialogs.