‘Variants’ tab of global options

CS-Cart 2.0.4 tells you the following in ‘Variants’ tab of global options…

Click on the Extra link to display additional parameters:

- Icon - icon of the option. You can download the icon from a local computer, a

server or type a direct link to the image. Here you can also define an alternative text for the icon;

Is this a bug or the is the reason its not working for me using ‘checkbox’ got something to do with user error?