There are a set of icons, which could be used by Set(icons ...) command:

Icon	Name	Icon	Name	Icon	Name	Icon	Name	Icon	Name
	bookmark		click_icon		configure		default		down
	exit		edit		exec		file		fileclose
	fileexport		find		fit		folder		forward
	fullscreen		hash		info		launch		minimize
	minus		mute		next		no		ok
	pause		play		plus		previous		question
	rewind		refresh		star		stop		unmute
	up		view_text		view_tree		vol_down		vol_up