You can add a new option for the controls setting in the Theme preference tool. Controls options reside in the /usr/share/themes directory. The typical structure of a controls option in the file system is as follows:
Gaia hobespen-tresnako kontrol-ezarpenen aukera berri bat gehi daiteke. Kontrol-aukerak /usr/share/themes direktorioan daude. Fitxategi-sistemako kontrol-aukeren ohiko egitura honelakoa da: