public static void gtk_color_chooser_set_use_alpha(IntPtr chooser, bool use_alpha) { if (EtoEnvironment.Platform.IsLinux) { NMLinux.gtk_color_chooser_set_use_alpha(chooser, use_alpha); } else if (EtoEnvironment.Platform.IsMac) { NMMac.gtk_color_chooser_set_use_alpha(chooser, use_alpha); } else { NMWindows.gtk_color_chooser_set_use_alpha(chooser, use_alpha); } }