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

Icon	Name	Icon	Name	Icon	Name	Icon	Name	Icon	Name
	click_icon		default.png		down		file		fit
	folder		forward		fullscreen		icon		kill
	load		minimize		minus		mute		next
	pause		play		plus		previous		question
	question-x2		rewind		stop		unmute		up
	vol_down		vol_up