public static void SetBackgroundColor(this Gtk.Widget widget, Gtk.StateType state, Xwt.Drawing.Color color)
 {
     widget.SetBackgroundColor(state.ToGtk3StateFlags(), color);
 }
 public static Xwt.Drawing.Color GetBackgroundColor(this Gtk.Widget widget, Gtk.StateType state)
 {
     return(widget.GetBackgroundColor(state.ToGtk3StateFlags()));
 }