gtk-sharp 2.10.0.0 Gtk# is thread aware, but not thread safe; See the Gtk# Thread Programming for details. Event sender. Event arguments. Event handler. The following events utilize this delegate: Event data is passed via the parameter. To attach a to an event, add the MoveFocusHandler instance to the event. The methods referenced by the MoveFocusHandler instance are invoked whenever the event is raised, until the MoveFocusHandler is removed from the event. System.Delegate System.Void