true if the dialog uses a headerbar for action buttons instead of the action-area.
For technical reasons, this property is declared as an integer property, but you should only set it to true or false.
Builtin gtk.dialog.Dialog subclasses such as gtk.color_chooser_dialog.ColorChooserDialog set this property according to platform conventions (using the property@Gtk.Settings:gtk-dialogs-use-header setting).
Here is how you can achieve the same:
g_object_get (settings, "gtk-dialogs-use-header", &header, NULL);Builder instance for fluent chaining
Deprecated: Use gtk.window.Window instead
Set useHeaderBar property.