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