gnome-sharp 2.8.0.0 Gtk# is thread aware, but not thread safe; See the Gtk# Thread Programming for details. To be added. To be added. Event handler. The following events utilize this delegate: Event data is passed via the parameter. To attach a to an event, add the FontSetHandler instance to the event. The methods referenced by the FontSetHandler instance are invoked whenever the event is raised, until the FontSetHandler is removed from the event. System.Delegate System.Void