Give a button the specified look.
button.setLook('SELECTED')
Button.setLook(lookString)
lookString
String (not case sensitive). 'NORMAL', 'ROLL', 'DOWN', 'SELECTED', 'ROLLSELECTED' for the corresponding looks.
no return value
Do not use the setLook method to set the 'INACTIVE' look but the setInactive method: It sets the 'INACTIVATE' look and disable the Button.