ControlsComponentButton

Definition of a button in the controls component.

Name	Type	Description
class	string	css class to set on the button's DOM element
handler	(e:Event, id:string) => any	Handler for clicks (taps) on this button.
id	string	Button's id.
mode?	string	Optional UI mode to set when the button is pressed
title	string	Set as the button's DOM element's label attribute (a tooltip, effectively)