gdk-sharp 2.12.0.0 Gtk# is thread aware, but not thread safe; See the Gtk# Thread Programming for details. Describes how existing data is combined with new data. None. System.Enum GLib.GType(typeof(Gdk.PropModeGType)) Field Gdk.PropMode The new data replaces the existing data. Field Gdk.PropMode The new data is prepended to the existing data. Field Gdk.PropMode The new data is appended to the existing data.