public static void gtk_header_bar_set_show_close_button(IntPtr bar, bool setting) { if (EtoEnvironment.Platform.IsLinux) { NMLinux.gtk_header_bar_set_show_close_button(bar, setting); } else if (EtoEnvironment.Platform.IsMac) { NMMac.gtk_header_bar_set_show_close_button(bar, setting); } else { NMWindows.gtk_header_bar_set_show_close_button(bar, setting); } }