gtk-sharp 2.0.0.0 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 PopulatePopupHandler instance to the event. The methods referenced by the PopulatePopupHandler instance are invoked whenever the event is raised, until the PopulatePopupHandler is removed from the event. System.Delegate System.Void